<meta charset="utf-8"/>
<script type="text/javascript">//1.用于创建特定类型的对象//2.js开发的时候写单引号//造门function makeDoor(){//instanceof 指向当前父类if (!(this instanceof makeDoor)) {return makeDoor();};this.lock="普通";  //门上的锁this.figure="普通"; //门上的花纹this.create=function(){   //开始产门return  "【锁头】"+this.lock+"【花纹】"+this.figure;}}var xiaozhangjia=new makeDoor(); //小张家需要建门,//此处如果没有new ，会出现//“JS_singleton.html:46 Uncaught RangeError: Maximum call stack size exceeded”//堆栈溢出的错误。alert("xiaozhangjia"+xiaozhangjia.create());  //开始产门
</script>

<meta charset="utf-8"/>
<script type="text/javascript">//1.用于创建特定类型的对象//2.js开发的时候写单引号//声明一个AA公司,造门;将造门放到AA进来，略改一下语法var AA={      //造门function:makeDoor(figure){//instanceof 指向当前父类if (!(this instanceof makeDoor)) {return new makeDoor();};var _figure = "普通";if (figure) {_figure= figure;};this.lock="普通";  //门上的锁this.figure=_figure; //门上的花纹this.create=function(){   //开始产门return  "【锁头】"+this.lock+"【花纹】"+this.figure}}    //声明一个BB公司,也可以造门var BB={      //造门function : makeDoor(figure){//instanceof 指向当前父类if (!(this instanceof makeDoor)) {return new makeDoor();};var _figure = "普通";if (figure) {_figure= figure;};this.lock="普通";  //门上的锁this.figure=_figure; //门上的花纹this.create=function(){   //开始产门return  "【锁头】"+this.lock+"【花纹】"+this.figure}}var xiaozhangjia=new AA.makeDoor(); //小张家需要建门,//此处如果没有new ，会出现//“JS_singleton.html:46 Uncaught RangeError: Maximum call stack size exceeded”//堆栈溢出的错误。alert("xiaozhangjia"+xiaozhangjia.create());  //开始产门var xiaolijia =new BB.makeDoor('绚丽');//小李家也需要建门,alert("xiaolijia"+xiaolijia.create());
</script>