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2. ÔÚ javascript µÄÀàÖÐËùÓеķ½·¨ºÍÊôÐÔ¶¼ÊÇ"¹«ÓõÄ".
3. javascript Öеļ̳в¢²»ÊÇÃ÷È·¹æ¶¨µÄ,¶øÊÇͨ¹ýÄ£·ÂÀ´ÊµÏÖµÄ.ÓÐÒÔÏ·½·¨:
(1). ¶ÔÏóð³ä
function A(sColor){
this.color = sColor;
this.showColor = function(){
alert(this.color);
};
}
function B(sColor,sName){
this.newMethod = A;
this.newMethod(sColor);
delete this.newMethod;
this.name = sName; //еķ½·¨ºÍÊôÐÔÒªÔÚɾ³ýÁËз½·¨µÄ¶¨ Òåºó¶¨Òå
this.showName = function(){
alert(this.name);
};
}
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Èç¹û´æÔÚÒ»¸öÀà C Ïë¼Ì³ÐÀà A ºÍ B,Ö»ÒªÕâÑù:
function C(){
this.newMethod = A;
this.newMethod();
delete this.newMethod
this.newMethod = B;
this.newMethod();
delete this.newMethod
}
µ«ÊÇҪעÒâÈç¹û A ºÍ B ÖдæÔÚͬÃûµÄÊôÐÔ»òÕß·½·¨,Ôò B ¾ßÓиßÓÅÏȼ¶,ÒòΪËûÊǺóÃæµÄÀà¼Ì³Ð.
(2). call() ·½·¨
function B(sColor,sName){
//this.newMethod = A;
//this.newMethod(sColor);
//delete this.newMethod;
A.call(this,sColor);
this.name = sName;
this.showName = function(){
alert(this.name);
};
}
(3). apply() ·½·¨
function B(sColor,sName){
//this.newMethod = A;
//this.newMethod(sColor);
//delete this.newMethod;
A.apply(this,new Array(sColor));
this.name = sName;
this.showName = function(){
alert(this.name);
};
}
(4). ÔÐÍÁ´,ÔÐÍÁ´²»Ö§³Ö¶àÖؼ̳Ð
function A(){
}
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var c =
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function test(Num1,Num2){
return Num1+Num2;
alert(Num1+Num2); //never outputs
}
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function test(num){
alert(num+10);
}
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