JavaScriptѧϰ±Ê¼Ç£¨ËÄ£©
1.³öÓÚ°²È«¿¼ÂÇ£¬JavaScriptÖÐÖ»Óпª·¢Õß×Ô¶¨ÒåµÄÀà¿ÉÒÔ±»¼Ì³Ð¡£
2.ʹÓöÔÏóð³äʵÏּ̳Ð
function ClassA(sColor){
this.color=sColor;
this.showColor=function (){
alert(this.color);
};
}
function ClassB(sColor,sName){
this.newMethod=ClassA; //´Ë´¦½«ÀàClassAµÄ¹¹Ô캯ÊýClassA()¿´×öÒ»¸öÆÕͨº¯Êý½øÐÐÒýÓ㬼´»ñµÃÁ˳¬ÀàµÄ¹¹ÔìÆ÷
this.newMethod(sColor); //´Ë´¦µ÷ÓÃnewMethod()·½·¨¹¹ÔìÒ»¸öClassB¶ÔÏó
delete this.newMethod; //ɾ³ý¶ÔClassA()·½·¨µÄÒýÓã¬ÒÔºó²»ÄÜÔÙµ÷ÓÃËü£¬ÒòΪ¶ÔÏóÉú³Éºó²»¿ÉÄÜÔÙµ÷Óù¹Ô캯Êý
this.name=sName; //×ÓÀàµÄгÉÔ±±äÁ¿ºÍ·½·¨
this.showName=function (){
alert(this.name);
};
}
¶ÔÏóð³ä·½·¨µÄ¹Ø¼ü¾ÍÔÚÓÚ£¬Òª½«³¬ÀàµÄ¹¹Ô캯Êý¿´×öÒ»¸öÆÕͨº¯Êý½øÐÐÒýÓá£
ËùÓеÄгÉÔ±±äÁ¿ºÍз½·¨¶¼±ØÐëÔÚɾ³ýÁ˶Գ¬À๹ÔìÆ÷µÄÒýÓúó¶¨Ò壬·ñÔò¿ÉÄܻḲ¸Ç³¬ÀàµÄÏà¹ØÊôÐÔ¡£
¶ÔÏóð³ä¿ÉÒÔÖ§³Ö¶àÖØ¼Ì³Ð¡£
3.½«call()·½·¨ºÍ¶ÔÏóð³ä½áºÏʹÓÃ
function ClassB(sColor,sName){
ClassA.call(this,sColor); //¼´¶ÔClassBµÄʵÀýµ÷ÓÃClassA()¹¹Ô캯Êý£¬²¢½«sColor×÷Ϊ²ÎÊý´«Èë
this.name=sName;
 
Ïà¹ØÎĵµ£º
1.ECMAScriptµÄ»ù´¡¸ÅÄîÈçÏ£º
Çø·Ö´óСд
±äÁ¿Ê±ÈõÀàÐ͵Ä
ÿÐнáβµÄ·ÖºÅ¿ÉÓпÉÎÞ
×¢ÊÍÓëJava¡¢CºÍPHPÓïÑÔÏàͬ
»¨À¨ºÅ±íÃ÷´úÂë¿é
2.ÓëPython²»Í¬£¬ECMAScriptÖеıäÁ¿²»Ò»¶¨Òª³õʼ»¯£¬È磺
var test; //ÕýÈ·
3.±äÁ¿ÃûÐèÒª×ñÊØÁ½Ìõ¼òµ¥µÄ¹æÔò£º
µÚÒ»¸ö×Ö·û±ØÐëÊÇ×Öĸ¡ ......
×÷Õß
Dionysios G. Synodinos
ÒëÕß
ºî²®Þ±
·¢²¼ÓÚ
2010Äê5ÔÂ21ÈÕ ÏÂÎç9ʱ38·Ö
Akshell
ÊÇÒ»ÖÖÔÆ·þÎñ£¬ËüʹÓ÷þÎñ¶ËµÄ
JavaScriptºÍÔÚÏßµÄIDE°ïÖú¿ª·¢Õß½øÐпìËÙÓ¦ÓóÌÐò¿ª·¢¡£ Ëü»¹Ìá¹©ÔÆÍйܣ¬ËùÒÔ ......
1¡¢JS½âÊÍ˳Ðò
JavaScriptÊǰ´HTMLÎĵµÁ÷˳ÐòÖ´Ðе쬷Ö<script>¿é˳ÐòÖ´ÐУ¬JSÊÇÏÈÔ¤±àÒëÔÙÖ´ÐУ¬È»ºóÔٱ߱àÒë±ßÖ´ÐеÄÓïÑÔ£¬ÀýÈ磺
alert(a); //undefined
var a = 1;
alert(a); //1
Ϊʲô»á³öÏÖÉÏÊö½á¹ûÄØ£¿
´ð°¸£ºa±äÁ¿ÔÚÔ¤±àÒëµÄʱºò£¬ÒѾ´æÔÚÄÚ´æÖУ¬È»ºóJSÒýÇæ¿ªÊ¼Ö´ÐÐJS´úÂë£ ......
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>ͼƬÅÜÂíµÆ</title>
</head>
<body>
<div align="center" id="demo" style="overflow: hidden; height: 33px; width: 400px;
&nb ......
1.document.formName.item("itemName") ÎÊÌâ
˵Ã÷:IEÏÂ,¿ÉÒÔʹÓÃdocument.formName.item("itemName")»òdocument.formName.elements["elementName"];FirefoxÏÂ,Ö»ÄÜʹÓÃdocument.formName.elements["elementName"].
½â¾ö·½·¨:ͳһʹÓÃdocument.formName.elements["elementName"].
JQUERY:
$("#idName")
&nb ......