Javascript中使用For In遍历对象

Javascript中的For in类似于Java中增强的For循环，非常好用。。

格式:

for(var variable in obj)
{
    statement
}

 

例子：

 

<script language="javascript" type="text/javascript">
    function Apple()
    {
        this.color  = 'Red';
        this.weight = '10kg';
        this.name   = 'Red Apple';
    }

    var apple = new Apple();
    //definition prop as temp var
    for (var prop in apple)
    {
        // get property name by prop 
        // get property value by obj[prop] 
        document.write( prop + " : "+ apple[prop] + "<br>")
    }
</script>