Javascript中的with用法

1.看例子

<script language="javascript">
function Lakers() {
       this.name = "kobe bryant";
       this.age = "28";
       this.gender = "boy";
}
var people=new Lakers();
with(people)
{
       var str = "姓名: " + name + "<br>";
       str += "年龄：" + age + "<br>";
       str += "性别：" + gender;
       document.write(str);
}
</script>  

代码执行效果如下:

姓名: kobe bryant

年龄：28

性别：boy

2.系统对象

     <script type="text/javascript">

        with(location){
            var hostName = hostname;
            var url = href;
        }
        alert(hostName);
        alert(url);

    </script>

执行结果：

localhost

http://localhost/xxx.html