prototype 學習筆記整理

2019-11-21 01:16:04

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來源：轉載

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var Class = {
create: function() {
return function() {
this.initialize.apply(this, arguments);
}
}
}
定義了一個class函數(shù)作為創(chuàng)建類的模版或者說是原型
使用方法

復制代碼代碼如下:

 
<html> 
<title>Test Class.create()</title> 
<head> 
<script language="JavaScript" type="text/javascript" src="prototype.js"></script> 
<script> 
var llinzzi= Class.create(); 
llinzzi.prototype = { 
initialize:function(){ 
document.writeln('This is create when initialize'); 
}, 
fuv:function(){document.writeln('This is inline method');} 
} 
var linChild = new llinzzi(); 
</script> 
</head> 
<body> 
<script> 
//window.onload(linChild); 
window.onload(linChild.fuv()); 
</script>; 
</body> 
</html> 

////
This is create when initialize This is inline method ;
/////
就是當采用了prototype的Class.create();方法創(chuàng)建對象的時候,initialize作為特殊的方法,在創(chuàng)建實例的時候被執(zhí)行,用以初始化.
繼承
Object.extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
return destination;
}
此方法將拷貝所有的source object的屬性和方法到destination object.
Prototype 對Object類進行的擴展主要通過一個靜態(tài)函數(shù)Object.extend (destination, source)實現(xiàn)了JavaScript 中的繼承。從語義的角度, Object.extend (destination, source)方法有些不和邏輯, 因為它事實上僅僅實現(xiàn)了從源對象到目標對象的全息拷貝。不過你也可以這樣認為：由于目標對象擁有了所有源對象所擁有的特性, 所以看上去就像目標對象繼承了源對象(并加以擴展)一樣.
// make a (shallow) copy of obj1
var obj1 = {
method : "post",
args : ""
};
var obj2 = Object.extend({}, obj1);
使用例子：

復制代碼代碼如下:

 
<html> 
<title>Test Object.extend</title> 
<head> 
<script language="JavaScript" type="text/javascript" src="prototype.js"></script> 
<script> 
function log(message) { 
document.writeln(" >>>>>: " +message); 
} 
var obj1= { 
method : "post", 
args : "" 
}; 
var obj2 = Object.extend({}, obj1); 
log(obj2.method); 
log(obj1 == obj2); 
log(obj1.method); 
log(obj2 == obj1); 
</script> 
</head> 
<body> 
</body> 
</html> 

// merges in the given options object to the default options object
Object.extend(options, {
args : "data=454",
onComplete : function() { alert("done!"); }
});
options.method // "post"
options.args // "ata=454"
options.onComplete // function() { alert("done!"); }
使用例子：

復制代碼代碼如下:

 
<html> 
<title>Test Object.extend</title> 
<head> 
<script language="JavaScript" type="text/javascript" src="prototype.js"></script> 
<script> 
function log(message) { 
document.writeln(" >>>>>: " +message); 
} 
var options= { 
method : "post", 
args : "" 
}; 
Object.extend(options, { 
args : "data=454", 
onComplete : function() { alert("done!");} 
}); 
options.method // "post" 
options.args // "ata=454" 
options.onComplete // function() { alert("done!"); } 
log(options.method); 
log(options.args); 
log(options.onComplete); 
</script> 
</head> 
<body> 
</body> 
</html> 