案例：JavaScript案例     状态：可编辑再运行    进入竖版
 运行结果　
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<html>
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<head>
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<title>Example</title>
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</head>
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<body>
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<script type="text/javascript">
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function ClassA(sColor) {
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    this.color = sColor;
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}
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​
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ClassA.prototype.sayColor = function () {
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    alert(this.color);
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};
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​
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function ClassB(sColor, sName) {
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    ClassA.call(this, sColor);
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    this.name = sName;
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}
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​
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ClassB.prototype = new ClassA();
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​
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ClassB.prototype.sayName = function () {
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    alert(this.name);
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};
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​
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​
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var objA = new ClassA("blue");
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var objB = new ClassB("red", "John");
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objA.sayColor();
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objB.sayColor();
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objB.sayName();
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​
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</script>
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</body>
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</html>
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​