javascript中的 类初始化，遍历for in 以及with的用法

<script type="text/javascript"> 
function member(name,gender){ 
    this.name=name; 
    this.gender=gender; 
}

function showProperty(obj,objStr){ 
    var str=""; 
    for(var i in obj){ 
        str+=objStr+"."+i+" = "+obj[i]+"<br>" 
    } 
    return str; 
}

var obj =new member("刘若英","女"); 
//document.write(showProperty(obj,"person"));

with(document){ 
    write(showProperty(obj,"person")); 
} 
</script>

/*运行效果:

person.name = 刘若英 
person.gender = 女

*/