Javascript 中的 with 用法

<script>
   var name = "xinchen.hui";
   var b=function(){
        this.name = "laruence";
        this.age = 24;
    }
    var p = new b();
    with(document){
        write(name+"<br/>");
    with(p){
        write(age+"<br/>");
        write(name);
    }
}

</script>
 输出:
xinchen.hui
24
laruence