数组对象的方法重写

对数组对象方法的重写练习
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    function Marry(){
    this.length=arguments.length;
    for (var i=0;i<arguments.length;i++){
        this[i]=arguments[i];
    }
     this.pop=function (){
        var popData=this[this.length-1];
        delete this[this.length-1];
        this.length --;
        return popData;
    }
    this.push = function (){
        for (i=0;i<arguments.length;i++){
            this[this.length]=arguments[i];
            this.length++
        }
        return this.length;
    }
    this.shift =function (){
        var shiftData=this[0];
        delete this[0];
        this.length--;
        for (var i=0;i<this.length;i++)
        {
            this[i] = this[i+1];
        }
        delete this[this.length];
        return shiftData;
    }
    this.unshift = function (){
        var sum =this.length +arguments.length;
        for (i=sum-1;i>= arguments.length;i--){
            this[i]=this[i-arguments.length];
        }
        for (i=0;i<arguments.length;i++){
            this[i] =arguments[i];
            this.length++;
        }
        return this.length
    }
    this.MtoString = function (){
        var result = '';
        for (i=0;i<this.length-1;i++)
        {
            result = result +this[i]+',';
        }
        result+=this[i];
        return result;
    }
    }
    arr=new Marry('zhangsan','lisi','wangwu','maqi');
    console.log(arr.length);
    console.log(arr);
    document.write(arr[0]);
    console.log(arr.pop());
    console.log(arr.length);
    console.log(arr);
    console.log(arr.push('tt','wqwd','asdasd'));
    console.log(arr.push('yu'));
    console.log(arr);
    //
    console.log(arr);
    console.log(arr.shift());
    console.log(arr);
    console.log(arr.unshift('tuyi','nmb','hujing'));
    console.log(arr);
    console.log(arr.MtoString());
</script>
</body>
</html>
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