4 将继承封装成函数

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<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Title</title></head><body><script>    function extend(Child,Parent) {        var F = function () {};        F.prototype = Parent.prototype;        Child.prototype = new F();        Child.prototype.constructor = Child;        Child.uber = Parent.prototype;    }</script></body></html>
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