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

*/