标签:过滤 ons .com typeof prototype object 添加 fine 属性
来源:http://www.cnblogs.com/yun007/archive/2013/06/06/3121393.html
<script>
//----------------for用来遍历数组对象--
var i,myArr = [1,2,3];
for (var i = 0; i < myArr.length; i++) {
console.log(i+":"+myArr[i]);
};
//输出结果为:
0:1
1:2
2:3
//---------for-in 用来遍历非数组对象
var man ={hands:2,legs:2,heads:1};
//为所有的对象添加clone方法,即给内置原型(object,Array,function)增加原型属性,该方法很强大,也很危险
if(typeof Object.prototype.clone ==="undefined"){
Object.prototype.clone = function(){};
}
for(var i in man){
if (man.hasOwnProperty(i)) { //filter,只输出man的私有属性
console.log(i,":",man[i]);
};
}
//输出结果为: hands:2,legs:2,heads:1
for(var i in man) {//不使用过滤
console.log(i,":",man[i]);
}
//输出结果为
//hands : 2 index.html:20
//legs : 2 index.html:20
//heads : 1 index.html:20
//clone : function (){}
for(var i in man) {
if(Object.prototype.hasOwnProperty.call(man,i)) { //过滤
console.log(i,":",man[i]);
}
}
//输出结果为: hands:2,legs:2,heads:1
</script>
标签:过滤 ons .com typeof prototype object 添加 fine 属性
原文地址:http://www.cnblogs.com/quxiajun/p/6526365.html