实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<!DOCTYPE html>
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<html>
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<head>
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    <title>Scope-Safe Constructors 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 Person(name, age, job){
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            if (this instanceof Person){
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                this.name = name;
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                this.age = age;
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                this.job = job;
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            } else {
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                return new Person(name, age, job);
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            }
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        }
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        var person1 = Person("Nicholas", 29, "Software Engineer");
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        alert(window.name);   //""
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        alert(person1.name);  //"Nicholas"
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        var person2 = new Person("Shelby", 34, "Ergonomist");
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        alert(person2.name);  //"Shelby"
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​
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​
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    </script>
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</body>
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</html>
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