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ECMAScript �l�承机制实现

ljwiie — Thu, 06 May 2010 15:57:00 GMT

用构造函数定义属性，用原型定义方�?br /> function ClassA(sColor) {
    this.color = sColor;
}

ClassA.prototype.sayColor = function () {
    alert(this.color);
};

function ClassB(sColor, sName) {

ClassA.call(this, sColor);

this.name = sName;
}

ClassB.prototype = new ClassA();

ClassB.prototype.sayName = function () {
alert(this.name);
};
在此例子中，�l�承机制�׃��行突出显�C�的蓝色代码实现。在�W�一行突出显�C�的代码中，�?ClassB 构造函��C��Q�用对象冒充�l�承 ClassA �cȝ�� sColor 属性。在�W�二行突出显�C�的代码中，用原型链�l�承 ClassA �cȝ��Ҏ��。由于这�U��؜合方式��用了原型链，所�?instanceof �q�算�W�仍能正��运行�?br />

下面的例子测试了�q�段代码�Q?br /> var objA = new ClassA("blue");
var objB = new ClassB("red", "John");
objA.sayColor(); //输出 "blue"
objB.sayColor(); //输出 "red"
objB.sayName(); //输出 "John"

摘自http://www.w3school.com.cn/js/pro_js_inheritance_implementing.asp

ljwiie 2010-05-06 23:57 发表评论

子窗口刷新父�H�口

ljwiie — Wed, 13 Dec 2006 04:28:00 GMT

1.
      parent.window.location.reload();

2. window.open( [sURL] [, sName] [, sFeatures] [, bReplace])
      window.opener.location.reload();

3. window.showModalDialog(sURL [, vArguments] [, sFeatures])
      vArguments �?window表示�Q�代表该window对象
      window.dialogArguments.location.reload();

ljwiie 2006-12-13 12:28 发表评论

JS对象

ljwiie — Fri, 04 Aug 2006 03:33:00 GMT

JS对象

    function print(){
        document.write("书名�?" + this.name + "
");
        document.write("作者�ؓ:" + this.author + "
");
    }

    function book(name,author){
        this.name = name;
        this.author = author;
        this.print = print; //没有括号
    }

    var c = new book("C语言","谭浩�?);
    c.print();
    document.write("
");

    for(var prop in c){
        document.write(prop + ":" + c[prop] + "
");
    }
    document.write("
");

    book.prototype.price = 10;
    for(var prop in c){
        document.write(prop + ":" + c[prop] + "
");
    }

ljwiie 2006-08-04 11:33 发表评论