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  2956  次浏览      27
 

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³õ¼¶Javascript£º

1.JavaScriptÊÇÒ»ÃÅʲôÑùµÄÓïÑÔ£¬ËüÓÐÄÄÐ©ÌØµã£¿

ûÓбê×¼´ð°¸¡£

2.JavaScriptµÄÊý¾ÝÀàÐͶ¼ÓÐʲô£¿

»ù±¾Êý¾ÝÀàÐÍ£ºString,boolean,Number,Undefined, Null

ÒýÓÃÊý¾ÝÀàÐÍ£ºObject(Array,Date,RegExp,Function)

ÄÇôÎÊÌâÀ´ÁË£¬ÈçºÎÅжÏij±äÁ¿ÊÇ·ñΪÊý×éÊý¾ÝÀàÐÍ£¿

·½·¨Ò».ÅÐ¶ÏÆäÊÇ·ñ¾ßÓС°Êý×éÐÔÖÊ¡±£¬Èçslice()·½·¨¡£¿É×Ô¼º¸ø¸Ã±äÁ¿¶¨Òåslice·½·¨£¬¹ÊÓÐʱ»áʧЧ

·½·¨¶þ.obj instanceof Array ÔÚijЩIE°æ±¾Öв»ÕýÈ·

·½·¨Èý.·½·¨Ò»¶þ½ÔÓЩ¶´£¬ÔÚECMA Script5Öж¨ÒåÁËз½·¨Array.isArray(), ±£Ö¤Æä¼æÈÝÐÔ£¬×îºÃµÄ·½·¨ÈçÏ£º

if(typeof Array.isArray==="undefined")
{
Array.isArray = function(arg){
return Object.prototype.toString.call(arg)==="[object Array]"
};
}

3.ÒÑÖªIDµÄInputÊäÈë¿ò£¬Ï£Íû»ñÈ¡Õâ¸öÊäÈë¿òµÄÊäÈëÖµ£¬Ôõô×ö£¿(²»Ê¹ÓõÚÈý·½¿ò¼Ü)

document.getElementById(¡°ID¡±).value

4.Ï£Íû»ñÈ¡µ½Ò³ÃæÖÐËùÓеÄcheckboxÔõô×ö£¿(²»Ê¹ÓõÚÈý·½¿ò¼Ü)

var domList = document.getElementsByTagName(¡®input¡¯)
var checkBoxList = [];
var len = domList.length;¡¡¡¡//»º´æµ½¾Ö²¿±äÁ¿
while (len--) {¡¡¡¡//ʹÓÃwhileµÄЧÂÊ»á±ÈforÑ­»·¸ü¸ß
¡¡¡¡if (domList[len].type == ¡®checkbox¡¯) {
¡¡¡¡checkBoxList.push(domList[len]);
¡¡¡¡}
}

5.ÉèÖÃÒ»¸öÒÑÖªIDµÄDIVµÄhtmlÄÚÈÝΪxxxx£¬×ÖÌåÑÕÉ«ÉèÖÃΪºÚÉ«(²»Ê¹ÓõÚÈý·½¿ò¼Ü)

var dom = document.getElementById(¡°ID¡±);
dom.innerHTML = ¡°xxxx¡±
dom.style.color = ¡°#000¡±

6.µ±Ò»¸öDOM½Úµã±»µã»÷ʱºò£¬ÎÒÃÇÏ£ÍûÄܹ»Ö´ÐÐÒ»¸öº¯Êý£¬Ó¦¸ÃÔõô×ö£¿

Ö±½ÓÔÚDOMÀï°ó¶¨Ê¼þ£º<div onclick=¡±test()¡±></div>

ÔÚJSÀïͨ¹ýonclick°ó¶¨£ºxxx.onclick = test

ͨ¹ýʼþÌí¼Ó½øÐа󶨣ºaddEventListener(xxx, ¡®click¡¯, test)

ÄÇôÎÊÌâÀ´ÁË£¬JavascriptµÄʼþÁ÷Ä£ÐͶ¼ÓÐʲô£¿

¡°Ê¼þðÅÝ¡±£ºÊ¼þ¿ªÊ¼ÓÉ×î¾ßÌåµÄÔªËØ½ÓÊÜ£¬È»ºóÖð¼¶ÏòÉÏ´«²¥

¡°Ê¼þ²¶×½¡±£ºÊ¼þÓÉ×î²»¾ßÌåµÄ½ÚµãÏȽÓÊÕ£¬È»ºóÖð¼¶ÏòÏ£¬Ò»Ö±µ½×î¾ßÌåµÄ

¡°DOMʼþÁ÷¡±£ºÈý¸ö½×¶Î£ºÊ¼þ²¶×½£¬Ä¿±ê½×¶Î£¬Ê¼þðÅÝ

7.ʲôÊÇAjaxºÍJSON£¬ËüÃǵÄÓÅȱµã¡£

AjaxÊÇÒì²½JavaScriptºÍXML£¬ÓÃÓÚÔÚWebÒ³ÃæÖÐʵÏÖÒì²½Êý¾Ý½»»¥¡£

Óŵ㣺

¿ÉÒÔʹµÃÒ³Ãæ²»ÖØÔØÈ«²¿ÄÚÈݵÄÇé¿öϼÓÔØ¾Ö²¿ÄÚÈÝ£¬½µµÍÊý¾Ý´«ÊäÁ¿

±ÜÃâÓû§²»¶ÏˢлòÕßÌø×ªÒ³Ãæ£¬Ìá¸ßÓû§ÌåÑé

ȱµã£º

¶ÔËÑË÷ÒýÇæ²»ÓѺÃ

ҪʵÏÖajaxϵÄǰºóÍ˹¦Äܳɱ¾½Ï´ó

¿ÉÄÜÔì³ÉÇëÇóÊýµÄÔö¼Ó

¿çÓòÎÊÌâÏÞÖÆ

JSONÊÇÒ»ÖÖÇáÁ¿¼¶µÄÊý¾Ý½»»»¸ñʽ£¬ECMAµÄÒ»¸ö×Ó¼¯

Óŵ㣺ÇáÁ¿¼¶¡¢Ò×ÓÚÈ˵ÄÔĶÁºÍ±àд£¬±ãÓÚ»úÆ÷£¨JavaScript£©½âÎö£¬Ö§³Ö¸´ºÏÊý¾ÝÀàÐÍ£¨Êý×é¡¢¶ÔÏó¡¢×Ö·û´®¡¢Êý×Ö£©

8.¿´ÏÂÁдúÂëÊä³öΪºÎ£¿½âÊÍÔ­Òò¡£

var a;
alert(typeof a); // undefined
alert(b); // ±¨´í

½âÊÍ£ºUndefinedÊÇÒ»¸öÖ»ÓÐÒ»¸öÖµµÄÊý¾ÝÀàÐÍ£¬Õâ¸öÖµ¾ÍÊÇ¡°undefined¡±£¬ÔÚʹÓÃvarÉùÃ÷±äÁ¿µ«²¢Î´¶ÔÆä¸³Öµ½øÐгõʼ»¯Ê±£¬Õâ¸ö±äÁ¿µÄÖµ¾ÍÊÇundefined¡£¶øbÓÉÓÚδÉùÃ÷½«±¨´í¡£×¢ÒâδÉêÃ÷µÄ±äÁ¿ºÍÉùÃ÷ÁËδ¸³ÖµµÄÊDz»Ò»ÑùµÄ¡£

9.¿´ÏÂÁдúÂë,Êä³öʲô£¿½âÊÍÔ­Òò¡£

var a = null;
alert(typeof a); //object

½âÊÍ£ºnullÊÇÒ»¸öÖ»ÓÐÒ»¸öÖµµÄÊý¾ÝÀàÐÍ£¬Õâ¸öÖµ¾ÍÊÇnull¡£±íʾһ¸ö¿ÕÖ¸Õë¶ÔÏó£¬ËùÒÔÓÃtypeof¼ì²â»á·µ»Ø¡±object¡±¡£

10.¿´ÏÂÁдúÂë,Êä³öʲô£¿½âÊÍÔ­Òò¡£

var undefined;
undefined == null; // true
1 == true; // true
2 == true; // false
0 == false; // true
0 == ''; // true
NaN == NaN; // false
[] == false; // true
[] == ![]; // true

undefinedÓënullÏàµÈ£¬µ«²»ºãµÈ£¨===£©

Ò»¸öÊÇnumberÒ»¸öÊÇstringʱ£¬»á³¢ÊÔ½«stringת»»Îªnumber

³¢ÊÔ½«booleanת»»Îªnumber£¬0»ò1

³¢ÊÔ½«Objectת»»³Énumber»òstring£¬È¡¾öÓÚÁíÍâÒ»¸ö¶Ô±ÈÁ¿µÄÀàÐÍ

ËùÒÔ£¬¶ÔÓÚ0¡¢¿Õ×Ö·û´®µÄÅжϣ¬½¨ÒéʹÓà ¡°===¡± ¡£¡°===¡±»áÏÈÅжÏÁ½±ßµÄÖµÀàÐÍ£¬ÀàÐͲ»Æ¥ÅäʱΪfalse¡£

ÄÇôÎÊÌâÀ´ÁË£¬¿´ÏÂÃæµÄ´úÂ룬Êä³öʲô£¬fooµÄֵΪʲô£¿

var foo = "11"+2-"1";
console.log(foo);
console.log(typeof foo);

Ö´ÐÐÍêºófooµÄֵΪ111£¬fooµÄÀàÐÍΪString¡£

11.¿´´úÂë¸ø´ð°¸¡£

var a = new Object();
a.value = 1;
b = a;
b.value = 2;
alert(a.value);

´ð°¸£º2£¨¿¼²ìÒýÓÃÊý¾ÝÀàÐÍϸ½Ú£©

12.ÒÑÖªÊý×évar stringArray = [¡°This¡±, ¡°is¡±, ¡°Baidu¡±, ¡°Campus¡±]£¬Alert³ö¡±This is Baidu Campus¡±¡£

´ð°¸£ºalert(stringArray.join(¡°¡±))

ÒÑÖªÓÐ×Ö·û´®foo=¡±get-element-by-id¡±,дһ¸öfunction½«Æäת»¯³ÉÍÕ·å±íʾ·¨¡±getElementById¡±¡£

function combo(msg){
var arr=msg.split("-");
for(var i=1;i<arr.length;i++){
arr[i]=arr[i].charAt(0).toUpperCase()+arr[i].substr(1,arr[i].length-1);
}
msg=arr.join("");
return msg;
}

(¿¼²ì»ù´¡API)

13.var numberArray = [3,6,2,4,1,5]; £¨¿¼²ì»ù´¡API£©

1) ʵÏÖ¶Ô¸ÃÊý×éµÄµ¹ÅÅ£¬Êä³ö[5,1,4,2,6,3]

2) ʵÏÖ¶Ô¸ÃÊý×éµÄ½µÐòÅÅÁУ¬Êä³ö[6,5,4,3,2,1]

function combo(msg){
var arr=msg.split("-");
for(var i=1;i<arr.length;i++){
arr[i]=arr[i].charAt(0).toUpperCase()+arr[i].substr(1,arr[i].length-1);
}
msg=arr.join("");
return msg;
}

14.Êä³ö½ñÌìµÄÈÕÆÚ£¬ÒÔYYYY-MM-DDµÄ·½Ê½£¬±ÈÈç½ñÌìÊÇ2014Äê9ÔÂ26ÈÕ£¬ÔòÊä³ö2014-09-26

var d = new Date();
// »ñÈ¡Ä꣬getFullYear()·µ»Ø4λµÄÊý×Ö
var year = d.getFullYear();
// »ñȡԣ¬Ô·ݱȽÏÌØÊ⣬0ÊÇ1Ô£¬11ÊÇ12ÔÂ
var month = d.getMonth() + 1;
// ±ä³ÉÁ½Î»
month = month < 10 ? '0' + month : month;
// »ñÈ¡ÈÕ
var day = d.getDate();
day = day < 10 ? '0' + day : day;
alert(year + '-' + month + '-' + day);

15.½«×Ö·û´®¡±<tr><td>{$id}</td><td>{$name}</td></tr>¡±ÖеÄ{$id}Ìæ»»³É10£¬{$name}Ìæ»»³ÉTony £¨Ê¹ÓÃÕýÔò±í´ïʽ£©

´ð°¸£º¡±<tr><td>{$id}</td><td>{$id}_{$name}</td></tr>¡±.replace(/{\$id}/g, ¡¯10¡ä).replace(/{\$name}/g, ¡®Tony¡¯);

16.ΪÁ˱£Ö¤Ò³ÃæÊä³ö°²È«£¬ÎÒÃǾ­³£ÐèÒª¶ÔÒ»Ð©ÌØÊâµÄ×Ö·û½øÐÐתÒ壬Çëдһ¸öº¯ÊýescapeHtml£¬½«<, >, &, ¡°½øÐÐתÒå

function escapeHtml(str) {
return str.replace(/[<>¡±&]/g, function(match) {
switch (match) {
case ¡°<¡±:
return ¡°&lt;¡±;
case ¡°>¡±:
return ¡°&gt;¡±;
case ¡°&¡±:
return ¡°&amp;¡±;
case ¡°\¡±¡±:
return ¡°&quot;¡±;
}
});
}

17.foo = foo||bar £¬ÕâÐдúÂëÊÇʲôÒâ˼£¿ÎªÊ²Ã´ÒªÕâÑùд£¿

´ð°¸£ºif(!foo) foo = bar; //Èç¹ûfoo´æÔÚ£¬Öµ²»±ä£¬·ñÔò°ÑbarµÄÖµ¸³¸øfoo¡£

¶Ì·±í´ïʽ£º×÷Ϊ¡±&&¡±ºÍ¡±||¡±²Ù×÷·ûµÄ²Ù×÷Êý±í´ïʽ£¬ÕâЩ±í´ïʽÔÚ½øÐÐÇóֵʱ£¬Ö»Òª×îÖյĽá¹ûÒѾ­¿ÉÒÔÈ·¶¨ÊÇÕæ»ò¼Ù£¬ÇóÖµ¹ý³Ì±ã¸æÖÕÖ¹£¬Õâ³ÆÖ®Îª¶Ì·ÇóÖµ¡£

18.¿´ÏÂÁдúÂ룬½«»áÊä³öʲô?(±äÁ¿ÉùÃ÷ÌáÉý)

var foo = 1;
function(){
console.log(foo);
var foo = 2;
console.log(foo);
}

´ð°¸£ºÊä³öundefined ºÍ 2¡£ÉÏÃæ´úÂëÏ൱ÓÚ£º

var foo = 1;
function(){
var foo;
console.log(foo); //undefined
foo = 2;
console.log(foo); // 2;
}

º¯ÊýÉùÃ÷Óë±äÁ¿ÉùÃ÷»á±»JavaScriptÒýÇæÒþʽµØÌáÉýµ½µ±Ç°×÷ÓÃÓòµÄ¶¥²¿£¬µ«ÊÇÖ»ÌáÉýÃû³Æ²»»áÌáÉý¸³Öµ²¿·Ö¡£

19.ÓÃjsʵÏÖËæ»úѡȡ10¨C100Ö®¼äµÄ10¸öÊý×Ö£¬´æÈëÒ»¸öÊý×飬²¢ÅÅÐò¡£

var iArray = []; 
funtion getRandom(istart, iend){
var iChoice = istart - iend +1;
return Math.floor(Math.random() * iChoice + istart;
}
for(var i=0; i<10; i++){
iArray.push(getRandom(10,100));
}
iArray.sort();

20.°ÑÁ½¸öÊý×éºÏ²¢£¬²¢É¾³ýµÚ¶þ¸öÔªËØ¡£

var array1 = ['a','b','c'];
var bArray = ['d','e','f'];
var cArray = array1.concat(bArray);
cArray.splice(1,1);

21.ÔõÑùÌí¼Ó¡¢ÒƳý¡¢Òƶ¯¡¢¸´ÖÆ¡¢´´½¨ºÍ²éÕҽڵ㣨ԭÉúJS£¬ÊµÔÚ»ù´¡£¬Ã»Ï¸Ð´Ã¿Ò»²½£©

1£©´´½¨Ð½ڵã

createDocumentFragment() //´´½¨Ò»¸öDOMƬ¶Î

createElement() //´´½¨Ò»¸ö¾ßÌåµÄÔªËØ

createTextNode() //´´½¨Ò»¸öÎı¾½Úµã

2£©Ìí¼Ó¡¢ÒƳý¡¢Ìæ»»¡¢²åÈë

appendChild() //Ìí¼Ó

removeChild() //ÒÆ³ý

replaceChild() //Ìæ»»

insertBefore() //²åÈë

3£©²éÕÒ

getElementsByTagName() //ͨ¹ý±êÇ©Ãû³Æ

getElementsByName() //ͨ¹ýÔªËØµÄNameÊôÐÔµÄÖµ

getElementById() //ͨ¹ýÔªËØId£¬Î¨Ò»ÐÔ

22.ÓÐÕâÑùÒ»¸öURL£ºhttp://item.taobao.com/item.htm?a=1&b=2&c=&d=xxx&e£¬Çëдһ¶ÎJS³ÌÐòÌáÈ¡URLÖеĸ÷¸öGET²ÎÊý(²ÎÊýÃûºÍ²ÎÊý¸öÊý²»È·¶¨)£¬½«Æä°´key-valueÐÎʽ·µ»Øµ½Ò»¸öjson½á¹¹ÖУ¬Èç{a:¡¯1¡ä, b:¡¯2¡ä, c:¡±, d:¡¯xxx¡¯, e:undefined}¡£

´ð°¸£º

function serilizeUrl(url) {
var result = {};
url = url.split("?")[1];
var map = url.split("&");
for(var i = 0, len = map.length; i < len; i++) {
result<script>jQuery(function($) {$("#google-maps-1").gMap({controls: false,scrollwheel: false,markers: [{address: "",icon: {image: "http://blog.jobbole.com/wp-content/themes/jobboleblogv3/_assets/img/_colors/red/pin.png", iconsize: [32, 32],iconanchor: [16,27],infowindowanchor: [16, 27]}}],address: "",zoom: 15,icon: {image: "http://blog.jobbole.com/wp-content/themes/jobboleblogv3/_assets/img/_colors/red/pin.png",iconsize: [32, 32],iconanchor: [16,27],infowindowanchor: [16, 27]}});});</script><div id="google-maps-1" class="google-maps" style="width: 100%; height: 200px;"></div>.split("=")[0]] = map[i].split("=")[1];
}
return result;
}

23.ÕýÔò±í´ïʽ¹¹Ô캯Êývar reg=new RegExp(¡°xxx¡±)ÓëÕýÔò±í´ï×ÖÃæÁ¿var reg=//ÓÐʲô²»Í¬£¿Æ¥ÅäÓÊÏäµÄÕýÔò±í´ïʽ£¿

´ð°¸£ºµ±Ê¹ÓÃRegExp()¹¹Ô캯ÊýµÄʱºò£¬²»½öÐèҪתÒåÒýºÅ£¨¼´\¡±±íʾ¡±£©£¬²¢ÇÒ»¹ÐèҪ˫·´Ð±¸Ü£¨¼´\\±íʾһ¸ö\£©¡£Ê¹ÓÃÕýÔò±í´ï×ÖÃæÁ¿µÄЧÂʸü¸ß¡£

ÓÊÏäµÄÕýÔòÆ¥Å䣺

var regMail = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+((.[a-zA-Z0-9_-]{2,3}){1,2})$/;

24.¿´ÏÂÃæ´úÂ룬¸ø³öÊä³ö½á¹û¡£

for(var i=1;i<=3;i++){
setTimeout(function(){
console.log(i);
},0);
};

´ð°¸£º4 4 4¡£

Ô­Òò£ºJavascriptʼþ´¦ÀíÆ÷ÔÚÏ߳̿ÕÏÐ֮ǰ²»»áÔËÐС£×·ÎÊ£¬ÈçºÎÈÃÉÏÊö´úÂëÊä³ö1 2 3£¿

for(var i=1;i<=3;i++){
setTimeout((function(a){ //¸Ä³ÉÁ¢¼´Ö´Ðк¯Êý
console.log(a);
})(i),0);
};

1 //Êä³ö
2

25.дһ¸öfunction£¬Çå³ý×Ö·û´®Ç°ºóµÄ¿Õ¸ñ¡££¨¼æÈÝËùÓÐä¯ÀÀÆ÷£©

ʹÓÃ×Ô´ø½Ó¿Útrim()£¬¿¼ÂǼæÈÝÐÔ£º

if (!String.prototype.trim) { 
String.prototype.trim = function() {
return this.replace(/^\s+/, "").replace(/\s+$/,"");
}
}

// test the function
var str = " \t\n test string ".trim();
alert(str == "test string"); // alerts "true"

26.JavascriptÖÐcalleeºÍcallerµÄ×÷Óã¿

´ð°¸£º

callerÊÇ·µ»ØÒ»¸ö¶Ôº¯ÊýµÄÒýÓ㬸ú¯Êýµ÷ÓÃÁ˵±Ç°º¯Êý£»

calleeÊÇ·µ»ØÕýÔÚ±»Ö´ÐеÄfunctionº¯Êý£¬Ò²¾ÍÊÇËùÖ¸¶¨µÄfunction¶ÔÏóµÄÕýÎÄ¡£

ÄÇôÎÊÌâÀ´ÁË£¿Èç¹ûÒ»¶ÔÍÃ×ÓÿÔÂÉúÒ»¶ÔÍÃ×Ó£»Ò»¶ÔÐÂÉúÍ㬴ӵڶþ¸öÔÂÆð¾Í¿ªÊ¼ÉúÍÃ×Ó£»¼Ù¶¨Ã¿¶ÔÍÃ×Ó¶¼ÊÇÒ»´ÆÒ»ÐÛ£¬ÊÔÎÊÒ»¶ÔÍÃ×Ó£¬µÚn¸öÔÂÄÜ·±Ö³³É¶àÉÙ¶ÔÍÃ×Ó£¿£¨Ê¹ÓÃcalleeÍê³É£©

var result=[];
function fn(n){ //µäÐ͵Äì³²¨ÄÇÆõÊýÁÐ
if(n==1){
return 1;
}else if(n==2){
return 1;
}else{
if(result[n]){
return result[n];
}else{
//argument.callee()±íʾfn()
result[n]=arguments.callee(n-1)+arguments.callee(n-2);
return result[n];
}
}
}

Öм¶Javascript£º

1.ʵÏÖÒ»¸öº¯Êýclone£¬¿ÉÒÔ¶ÔJavaScriptÖеÄ5ÖÖÖ÷ÒªµÄÊý¾ÝÀàÐÍ£¨°üÀ¨Number¡¢String¡¢Object¡¢Array¡¢Boolean£©½øÐÐÖµ¸´ÖÆ

¿¼²ìµã1£º¶ÔÓÚ»ù±¾Êý¾ÝÀàÐͺÍÒýÓÃÊý¾ÝÀàÐÍÔÚÄÚ´æÖдæ·ÅµÄÊÇÖµ»¹ÊÇÖ¸ÕëÕâÒ»Çø±ðÊÇ·ñÇå³þ

¿¼²ìµã2£ºÊÇ·ñÖªµÀÈçºÎÅжÏÒ»¸ö±äÁ¿ÊÇʲôÀàÐ͵Ä

¿¼²ìµã3£ºµÝ¹éËã·¨µÄÉè¼Æ

// ·½·¨Ò»£º
Object.prototype.clone = function(){
var o = this.constructor === Array ? [] : {};
for(var e in this){
o[e] = typeof this[e] === "object" ? this[e].clone() : this[e];
}
return o;
}

//·½·¨¶þ£º
/**
* ¿Ë¡һ¸ö¶ÔÏó
* @param Obj
* @returns
*/
function clone(Obj) {
var buf;
if (Obj instanceof Array) {
buf = []; //´´½¨Ò»¸ö¿ÕµÄÊý×é
var i = Obj.length;
while (i--) {
buf[i] = clone(Obj[i]);
}
return buf;
}else if (Obj instanceof Object){
buf = {}; //´´½¨Ò»¸ö¿Õ¶ÔÏó
for (var k in Obj) { //ΪÕâ¸ö¶ÔÏóÌí¼ÓеÄÊôÐÔ
buf[k] = clone(Obj[k]);
}
return buf;
}else{ //ÆÕͨ±äÁ¿Ö±½Ó¸³Öµ
return Obj;
}
}

2.ÈçºÎÏû³ýÒ»¸öÊý×éÀïÃæÖØ¸´µÄÔªËØ£¿

var arr=[1,2,3,3,4,4,5,5,6,1,9,3,25,4];
function deRepeat(){
var newArr=[];
var obj={};
var index=0;
var l=arr.length;
for(var i=0;i<l;i++){
if(obj[arr[i]]==undefined)
{
obj[arr[i]]=1;
newArr[index++]=arr[i];
}
else if(obj[arr[i]]==1)
continue;
}
return newArr;

}
var newArr2=deRepeat(arr);
alert(newArr2); //Êä³ö1,2,3,4,5,6,9,25

3.СÏÍÊÇÒ»Ìõ¿É°®µÄС¹·(Dog)£¬ËüµÄ½ÐÉùºÜºÃÌý(wow)£¬Ã¿´Î¿´µ½Ö÷È˵Äʱºò¾Í»á¹Ô¹Ô½ÐÒ»Éù(yelp)¡£´ÓÕâ¶ÎÃèÊö¿ÉÒԵõ½ÒÔ϶ÔÏó£º

function Dog() {
this.wow = function() {
alert(¡¯Wow¡¯);
}
this.yelp = function() {
this.wow();
}
}

СâºÍСÏÍÒ»Ñù£¬Ô­À´Ò²ÊÇÒ»Ìõ¿É°®µÄС¹·£¬¿ÉÊÇͻȻÓÐÒ»Ìì·èÁË(MadDog)£¬Ò»¿´µ½È˾ͻáÿ¸ô°ëÃë½ÐÒ»Éù(wow)µØ²»Í£½Ð»½(yelp)¡£Çë¸ù¾ÝÃèÊö£¬°´Ê¾ÀýµÄÐÎʽÓôúÂëÀ´Êµ¡££¨¼Ì³Ð£¬Ô­ÐÍ£¬setInterval£©

´ð°¸£º

function MadDog() {
this.yelp = function() {
var self = this;
setInterval(function() {
self.wow();
}, 500);
}
}
MadDog.prototype = new Dog();

//for test
var dog = new Dog();
dog.yelp();
var madDog = new MadDog();
madDog.yelp();

4.ÏÂÃæÕâ¸öul£¬ÈçºÎµã»÷ÿһÁеÄʱºòalertÆäindex?£¨±Õ°ü£©

<ul id=¡±test¡±>
<li>ÕâÊǵÚÒ»Ìõ</li>
<li>ÕâÊǵڶþÌõ</li>
<li>ÕâÊǵÚÈýÌõ</li>
</ul>

´ð°¸£º

// ·½·¨Ò»£º
var lis=document.getElementById('2223').getElementsByTagName('li');
for(var i=0;i<3;i++)
{
lis[i].index=i;
lis[i].onclick=function(){
alert(this.index);
};
}

//·½·¨¶þ£º
var lis=document.getElementById('2223').getElementsByTagName('li');
for(var i=0;i<3;i++)
{
lis[i].index=i;
lis[i].onclick=(function(a){
return function() {
alert(a);
}
})(i);
}

5.±àдһ¸öJavaScriptº¯Êý£¬ÊäÈëÖ¸¶¨ÀàÐ͵ÄÑ¡ÔñÆ÷(½öÐèÖ§³Öid£¬class£¬tagNameÈýÖÖ¼òµ¥CSSÑ¡ÔñÆ÷£¬ÎÞÐè¼æÈÝ×éºÏÑ¡ÔñÆ÷)¿ÉÒÔ·µ»ØÆ¥ÅäµÄDOM½Úµã£¬Ð迼ÂÇä¯ÀÀÆ÷¼æÈÝÐÔºÍÐÔÄÜ¡£

/*** @param selector {String} ´«ÈëµÄCSSÑ¡ÔñÆ÷¡£* @return {Array}*/

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var query = function(selector) {
var reg = /^(#)?(\.)?(\w+)$/img;
var regResult = reg.exec(selector);
var result = [];
//Èç¹ûÊÇidÑ¡ÔñÆ÷
if(regResult[1]) {
if(regResult[3]) {
if(typeof document.querySelector === "function") {
result.push(document.querySelector(regResult[3]));
}
else {
result.push(document.getElementById(regResult[3]));
}
}
}
//Èç¹ûÊÇclassÑ¡ÔñÆ÷
else if(regResult[2]) {
if(regResult[3]) {
if(typeof document.getElementsByClassName === 'function') {
var doms = document.getElementsByClassName(regResult[3]);
if(doms) {
result = converToArray(doms);
}
}
//Èç¹û²»Ö§³ÖgetElementsByClassNameº¯Êý
else {
var allDoms = document.getElementsByTagName("*") ;
for(var i = 0, len = allDoms.length; i < len; i++) {
if(allDoms[i].className.search(new RegExp(regResult[2])) > -1) {
result.push(allDoms[i]);
}
}
}
}
}
//Èç¹ûÊDZêǩѡÔñÆ÷
else if(regResult[3]) {
var doms = document.getElementsByTagName(regResult[3].toLowerCase());
if(doms) {
result = converToArray(doms);
}
}
return result;
}

function converToArray(nodes){
var array = null;
try{
array = Array.prototype.slice.call(nodes,0);//Õë¶Ô·ÇIEä¯ÀÀÆ÷
}catch(ex){
array = new Array();
for( var i = 0 ,len = nodes.length; i < len ; i++ ) {
array.push(nodes[i])
}
}
return array;
}

6.ÇëÆÀ¼ÛÒÔÏ´úÂë²¢¸ø³ö¸Ä½øÒâ¼û¡£

if(window.addEventListener){
var addListener = function(el,type,listener,useCapture){
el.addEventListener(type,listener,useCapture);
};
}
else if(document.all){
addListener = function(el,type,listener){
el.attachEvent("on"+type,function(){
listener.apply(el);
});
}
}

ÆÀ¼Û£º

¡¡²»Ó¦¸ÃÔÚifºÍelseÓï¾äÖÐÉùÃ÷addListenerº¯Êý£¬Ó¦¸ÃÏÈÉùÃ÷£»

²»ÐèҪʹÓÃwindow.addEventListener»òdocument.allÀ´½øÐмì²âä¯ÀÀÆ÷£¬Ó¦¸ÃʹÓÃÄÜÁ¦¼ì²â£»

ÓÉÓÚattachEventÔÚIEÖÐÓÐthisÖ¸ÏòÎÊÌ⣬ËùÒÔµ÷ÓÃËüʱÐèÒª´¦ÀíÒ»ÏÂ

¸Ä½øÈçÏ£º

function addEvent(elem, type, handler){
¡¡¡¡if(elem.addEventListener){
¡¡¡¡¡¡¡¡elem.addEventListener(type, handler, false);
¡¡¡¡}else if(elem.attachEvent){
¡¡¡¡¡¡¡¡elem['temp' + type + handler] = handler;
¡¡¡¡¡¡¡¡elem[type + handler] = function(){
¡¡¡¡¡¡¡¡elem['temp' + type + handler].apply(elem);
¡¡¡¡};
¡¡¡¡elem.attachEvent('on' + type, elem[type + handler]);¡¡
}else{
¡¡¡¡elem['on' + type] = handler;
¡¡¡¡}
}

7.¸øString¶ÔÏóÌí¼ÓÒ»¸ö·½·¨£¬´«ÈëÒ»¸östringÀàÐ͵IJÎÊý£¬È»ºó½«stringµÄÿ¸ö×Ö·û¼ä¼Û¸ñ¿Õ¸ñ·µ»Ø£¬ÀýÈ磺

addSpace(¡°hello world¡±) // -> ¡®h e l l o w o r l d¡¯

String.prototype.spacify = function(){
return this.split('').join(' ');
};

½Ó×ÅÉÏÊöÎÊÌâ´ð°¸ÌáÎÊ£¬1£©Ö±½ÓÔÚ¶ÔÏóµÄÔ­ÐÍÉÏÌí¼Ó·½·¨ÊÇ·ñ°²È«£¿ÓÈÆäÊÇÔÚObject¶ÔÏóÉÏ¡£(Õâ¸öÎÒûÄÜ´ð³ö£¿Ï£ÍûÖªµÀµÄ˵һÏ¡£)¡¡2£©º¯ÊýÉùÃ÷Ó뺯Êý±í´ïʽµÄÇø±ð£¿

´ð°¸£ºÔÚjsÖУ¬½âÎöÆ÷ÔÚÏòÖ´Ðл·¾³ÖмÓÔØÊý¾Ýʱ£¬¶Ôº¯ÊýÉùÃ÷ºÍº¯Êý±í´ïʽ²¢·ÇÊÇÒ»ÊÓͬÈʵ쬽âÎöÆ÷»áÂÊÏȶÁÈ¡º¯ÊýÉùÃ÷£¬²¢Ê¹ÆäÔÚÖ´ÐÐÈκδúÂë֮ǰ¿ÉÓ㨿ÉÒÔ·ÃÎÊ£©£¬ÖÁÓÚº¯Êý±í´ïʽ£¬Ôò±ØÐëµÈµ½½âÎöÆ÷Ö´Ðе½ËüËùÔڵĴúÂëÐУ¬²Å»áÕæÕý±»½âÎöÖ´ÐС£

8.¶¨ÒåÒ»¸ölog·½·¨£¬ÈÃËü¿ÉÒÔ´úÀíconsole.logµÄ·½·¨¡£

¿ÉÐеķ½·¨Ò»£º

function log(msg)¡¡{
console.log(msg);
}

log("hello world!") // hello world!

Èç¹ûÒª´«Èë¶à¸ö²ÎÊýÄØ£¿ÏÔÈ»ÉÏÃæµÄ·½·¨²»ÄÜÂú×ãÒªÇó£¬ËùÒÔ¸üºÃµÄ·½·¨ÊÇ£º

function log(){
console.log.apply(console, arguments);
};

µ½´Ë£¬×·ÎÊapplyºÍcall·½·¨µÄÒìͬ¡£

´ð°¸£º

¶ÔÓÚapplyºÍcallÁ½ÕßÔÚ×÷ÓÃÉÏÊÇÏàͬµÄ£¬¼´Êǵ÷ÓÃÒ»¸ö¶ÔÏóµÄÒ»¸ö·½·¨£¬ÒÔÁíÒ»¸ö¶ÔÏóÌæ»»µ±Ç°¶ÔÏó¡£½«Ò»¸öº¯ÊýµÄ¶ÔÏóÉÏÏÂÎÄ´Ó³õʼµÄÉÏÏÂÎĸıäΪÓÉ thisObj Ö¸¶¨µÄжÔÏó¡£

µ«Á½ÕßÔÚ²ÎÊýÉÏÓÐÇø±ðµÄ¡£¶ÔÓÚµÚÒ»¸ö²ÎÊýÒâÒå¶¼Ò»Ñù£¬µ«¶ÔµÚ¶þ¸ö²ÎÊý£º apply´«ÈëµÄÊÇÒ»¸ö²ÎÊýÊý×飬Ҳ¾ÍÊǽ«¶à¸ö²ÎÊý×éºÏ³ÉΪһ¸öÊý×é´«È룬¶øcallÔò×÷ΪcallµÄ²ÎÊý´«È루´ÓµÚ¶þ¸ö²ÎÊý¿ªÊ¼£©¡£ Èç func.call(func1,var1,var2,var3)¶ÔÓ¦µÄapplyд·¨Îª£ºfunc.apply(func1,[var1,var2,var3]) ¡£

9.ÔÚJavascriptÖÐʲôÊÇαÊý×飿ÈçºÎ½«Î±Êý×éת»¯Îª±ê×¼Êý×飿

´ð°¸£º

αÊý×飨ÀàÊý×飩£ºÎÞ·¨Ö±½Óµ÷ÓÃÊý×é·½·¨»òÆÚÍûlengthÊôÐÔÓÐÊ²Ã´ÌØÊâµÄÐÐΪ£¬µ«ÈÔ¿ÉÒÔ¶ÔÕæÕýÊý×é±éÀú·½·¨À´±éÀúËüÃÇ¡£µäÐ͵ÄÊǺ¯ÊýµÄargument²ÎÊý£¬»¹ÓÐÏñµ÷ÓÃgetElementsByTagName,document.childNodesÖ®ÀàµÄ,ËüÃǶ¼·µ»ØNodeList¶ÔÏó¶¼ÊôÓÚαÊý×é¡£¿ÉÒÔʹÓÃArray.prototype.slice.call(fakeArray)½«Êý×éת»¯ÎªÕæÕýµÄArray¶ÔÏó¡£

¼ÙÉè½ÓµÚ°ËÌâÌâ¸É£¬ÎÒÃÇÒª¸øÃ¿¸ölog·½·¨Ìí¼ÓÒ»¸ö¡±(app)¡±Ç°×º£¬±ÈÈ硯hello world!¡¯ ->¡¯(app)hello world!¡¯¡£·½·¨ÈçÏ£º

function log(){
var args = Array.prototype.slice.call(arguments); //ΪÁËʹÓÃunshiftÊý×é·½·¨£¬½«argumentת»¯ÎªÕæÕýµÄÊý×é
args.unshift('(app)');

console.log.apply(console, args);
};

10.¶Ô×÷ÓÃÓòÉÏÏÂÎĺÍthisµÄÀí½â£¬¿´ÏÂÁдúÂ룺

var User = {
count: 1,

getCount: function() {
return this.count;
}
};

console.log(User.getCount()); // what?

var func = User.getCount;
console.log(func()); // what?

ÎÊÁ½´¦consoleÊä³öʲô£¿ÎªÊ²Ã´£¿

´ð°¸ÊÇ1ºÍundefined¡£

funcÊÇÔÚwinodwµÄÉÏÏÂÎÄÖб»Ö´Ðеģ¬ËùÒÔ»á·ÃÎʲ»µ½countÊôÐÔ¡£

¼ÌÐø×·ÎÊ£¬ÄÇôÈçºÎÈ·±£Uesr×ÜÊÇÄÜ·ÃÎʵ½funcµÄÉÏÏÂÎÄ£¬¼´ÕýÈ··µ»Ø1¡£ÕýÈ·µÄ·½·¨ÊÇʹÓÃFunction.prototype.bind¡£¼æÈݸ÷¸öä¯ÀÀÆ÷ÍêÕû´úÂëÈçÏ£º

Function.prototype.bind = Function.prototype.bind || function(context){
var self = this;

return function(){
return self.apply(context, arguments);
};
}

var func = User.getCount.bind(User);
console.log(func());

11.Ô­ÉúJSµÄwindow.onloadÓëJqueryµÄ$(document).ready(function(){})ÓÐʲô²»Í¬£¿ÈçºÎÓÃÔ­ÉúJSʵÏÖJqµÄready·½·¨£¿

window.onload()·½·¨ÊDZØÐëµÈµ½Ò³ÃæÄÚ°üÀ¨Í¼Æ¬µÄËùÓÐÔªËØ¼ÓÔØÍê±Ïºó²ÅÄÜÖ´ÐС£

$(document).ready()ÊÇDOM½á¹¹»æÖÆÍê±Ïºó¾ÍÖ´ÐУ¬²»±ØµÈµ½¼ÓÔØÍê±Ï¡£

/*
* ´«µÝº¯Êý¸øwhenReady()
* µ±Îĵµ½âÎöÍê±ÏÇÒΪ²Ù×÷×¼±¸¾ÍÐ÷ʱ£¬º¯Êý×÷ΪdocumentµÄ·½·¨µ÷ÓÃ
*/
var whenReady = (function() { //Õâ¸öº¯Êý·µ»ØwhenReady()º¯Êý
var funcs = []; //µ±»ñµÃʼþʱ£¬ÒªÔËÐеĺ¯Êý
var ready = false; //µ±´¥·¢Ê¼þ´¦Àí³ÌÐòʱ,Çл»Îªtrue

//µ±Îĵµ¾ÍÐ÷ʱ,µ÷ÓÃʼþ´¦Àí³ÌÐò
function handler(e) {
if(ready) return; //È·±£Ê¼þ´¦Àí³ÌÐòÖ»ÍêÕûÔËÐÐÒ»´Î

//Èç¹û·¢Éúonreadystatechangeʼþ£¬µ«Æä״̬²»ÊÇcompleteµÄ»°,ÄÇôÎĵµÉÐδ׼±¸ºÃ
if(e.type === 'onreadystatechange' && document.readyState !== 'complete') {
return;
}

//ÔËÐÐËùÓÐ×¢²áº¯Êý
//×¢Òâÿ´Î¶¼Òª¼ÆËãfuncs.length
//ÒÔ·ÀÕâЩº¯ÊýµÄµ÷ÓÿÉÄܻᵼÖÂ×¢²á¸ü¶àµÄº¯Êý
for(var i=0; i<funcs.length; i++) {
funcs[i].call(document);
}
//ʼþ´¦Àíº¯ÊýÍêÕûÖ´ÐÐ,Çл»ready״̬, ²¢ÒƳýËùÓк¯Êý
ready = true;
funcs = null;
}
//Ϊ½ÓÊÕµ½µÄÈκÎʼþ×¢²á´¦Àí³ÌÐò
if(document.addEventListener) {
document.addEventListener('DOMContentLoaded', handler, false);
document.addEventListener('readystatechange', handler, false); //IE9+
window.addEventListener('load', handler, false);
}else if(document.attachEvent) {
document.attachEvent('onreadystatechange', handler);
window.attachEvent('onload', handler);
}
//·µ»ØwhenReady()º¯Êý
return function whenReady(fn) {
if(ready) { fn.call(document); }
else { funcs.push(fn); }
}
})();

Èç¹ûÉÏÊö´úÂëÊ®·ÖÄѶ®£¬ÏÂÃæÕâ¸ö¼ò»¯°æ£º

function ready(fn){
if(document.addEventListener) { //±ê×¼ä¯ÀÀÆ÷
document.addEventListener('DOMContentLoaded', function() {
//×¢Ïúʼþ, ±ÜÃâ·´¸´´¥·¢
document.removeEventListener('DOMContentLoaded',arguments.callee, false);
fn(); //Ö´Ðк¯Êý
}, false);
}else if(document.attachEvent) { //IE
document.attachEvent('onreadystatechange', function() {
if(document.readyState == 'complete') {
document.detachEvent('onreadystatechange', arguments.callee);
fn(); //º¯ÊýÖ´ÐÐ
}
});
}
};

12.£¨Éè¼ÆÌ⣩ÏëʵÏÖÒ»¸ö¶ÔÒ³ÃæÄ³¸ö½ÚµãµÄÍÏÒ·£¿ÈçºÎ×ö£¿£¨Ê¹ÓÃÔ­ÉúJS£©

»Ø´ð³ö¸ÅÄî¼´¿É£¬ÏÂÃæÊǼ¸¸öÒªµã

¸øÐèÒªÍÏ×§µÄ½Úµã°ó¶¨mousedown, mousemove, mouseupʼþ

mousedownʼþ´¥·¢ºó£¬¿ªÊ¼ÍÏ×§

mousemoveʱ£¬ÐèҪͨ¹ýevent.clientXºÍclientY»ñÈ¡ÍÏקλÖ㬲¢ÊµÊ±¸üÐÂλÖÃ

mouseupʱ£¬ÍÏ×§½áÊø

ÐèҪעÒâä¯ÀÀÆ÷±ß½çµÄÇé¿ö

13.

function setcookie(name,value,days){  //¸øcookieÔö¼ÓÒ»¸öʱ¼ä±äÁ¿
¡¡¡¡var exp = new Date();
¡¡¡¡exp.setTime(exp.getTime() + days*24*60*60*1000); //ÉèÖùýÆÚʱ¼äΪdaysÌì
¡¡¡¡document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}
function getCookie(name){
¡¡¡¡var result = "";
¡¡¡¡var myCookie = ""+document.cookie+";";
¡¡¡¡var searchName = "+name+"=";
¡¡¡¡var startOfCookie = myCookie.indexOf(searchName);
¡¡¡¡var endOfCookie;
¡¡¡¡if(satrtOfCookie != -1){
¡¡¡¡¡¡¡¡startOfcookie += searchName.length;
¡¡¡¡¡¡¡¡endOfCookie = myCookie.indexOf(";",startOfCookie);
¡¡¡¡¡¡¡¡result = (myCookie.substring(startOfCookie,endOfCookie));
¡¡¡¡}
¡¡¡¡return result;
}
(function(){
¡¡¡¡var oTips = document.getElementById('tips');//¼ÙÉètipsµÄidΪtips
¡¡¡¡var page = {
¡¡¡¡check: function(){//¼ì²étipsµÄcookieÊÇ·ñ´æÔÚ²¢ÇÒÔÊÐíÏÔʾ
¡¡¡¡¡¡¡¡var tips = getCookie('tips');
¡¡¡¡¡¡¡¡if(!tips || tips == 'show') return true;//tipsµÄcookie²»´æÔÚ
¡¡¡¡¡¡¡¡if(tips == "never_show_again") return false;
¡¡¡¡},
¡¡¡¡hideTip: function(bNever){
¡¡¡¡¡¡¡¡if(bNever) setcookie('tips', 'never_show_again', 365);
¡¡¡¡¡¡¡¡oTips.style.display = "none";//Òþ²Ø
¡¡¡¡},
¡¡¡¡showTip: function(){
¡¡¡¡oTips.style.display = "inline";//ÏÔʾ£¬¼ÙÉètipsΪÐм¶ÔªËØ
¡¡¡¡},
¡¡¡¡init: function(){
¡¡¡¡¡¡¡¡var _this = this;
¡¡¡¡¡¡¡¡if(this.check()){
¡¡¡¡¡¡¡¡_this.showTip();
¡¡¡¡¡¡¡¡setcookie('tips', 'show', 1);
¡¡¡¡}
¡¡¡¡oTips.onclick = function(){
¡¡¡¡¡¡¡¡_this.hideTip(true);
¡¡¡¡};
¡¡¡¡}
¡¡¡¡};
page.init();
})();

14.˵³öÒÔϺ¯ÊýµÄ×÷ÓÃÊÇ£¿¿Õ°×ÇøÓòÓ¦¸ÃÌîдʲô£¿

//define 
(function(window){
function fn(str){
this.str=str;
}

fn.prototype.format = function(){
var arg = ______;
return this.str.replace(_____,function(a,b){
return arg[b]||"";
});
}
window.fn = fn;
})(window);

//use
(function(){
var t = new fn('<p><a href="{0}">{1}</a><span>{2}</span></p>');
console.log(t.format('http://www.alibaba.com','Alibaba','Welcome'));
})();

´ð°¸£º·Ãº¯ÊýµÄ×÷ÓÃÊÇʹÓÃformatº¯Êý½«º¯ÊýµÄ²ÎÊýÌæ»»µô{0}ÕâÑùµÄÄÚÈÝ£¬·µ»ØÒ»¸ö¸ñʽ»¯ºóµÄ½á¹û£º

µÚÒ»¸ö¿ÕÊÇ£ºarguments

µÚ¶þ¸ö¿ÕÊÇ£º/\{(\d+)\}/ig

15.ÓÃÃæÏò¶ÔÏóµÄJavascriptÀ´½éÉÜÒ»ÏÂ×Ô¼º¡££¨Ã»´ð°¸Å¶Ç×£¬×Ô¼ºÊÔÊÔ°É£©

´ð°¸£º ¶ÔÏó»òÕßJson¶¼ÊDz»´íµÄÑ¡ÔñŶ£¬

¾õµÃÌâÄ¿»¹okµÄÇ×µã¸öÍÆ¼öŶ£¬ÌâÁ¿»á²»¶ÏÔö¼Ó¡£

Äã¿ÉÄÜ»á¸ÐÐËȤ£ºBAT¼°¸÷´ó»¥ÁªÍø¹«Ë¾2014ǰ¶Ë±ÊÊÔÃæÊÔÌâ¨CHtml,Cssƪ

ÔÝÇÒÌù³öÎÒ×ö³ö´ð°¸µÄ²¿·Ö¡£ÓÐʱ¼ä°Ñδ×ö³ö´ð°¸Ò²Ìù³öÀ´¡£Õë¶ÔÎÄÖи÷Ì⣬ÈçÓиüºÃµÄ½â¾ö·½·¨»òÕß´íÎóÖ®´¦£¬¸÷λÇ×Îñ±Ø¸æÖªÎÒ£¬ÎóÈË×ÓµÜʵÄË×ï¹ý¡£

¾õµÃÌâÄ¿»¹okµÄÇ×µã¸öÍÆ¼öŶ£¬ÌâÁ¿»á²»¶ÏÔö¼Ó¡£

   
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