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function Class() {
}
Class.prototype = { name: "aaa" };//更换整个原型
var a = new Class();
Class.prototype = { name: "bbb" };//更换整个原型
var b = new Class();
Class.prototype = { name: "ccc" };//更换整个原型
var c = new Class();
alert(a.name);//输出aaa
alert(b.name);//输出bbb
alert(c.name);//输出ccc