JavaScript 遍历及删除对象属性

var dic = {};
for(var i=0;i<5;i++){
　　dic["key_"+i] = Math.random();
}
delete dic["key_3"];
for(var obj in dic){
　　show(obj+":"+dic[obj]);
}

key_0:0.7691053473390639
key_1:0.07636464154347777
key_2:0.10051034926436841
key_4:0.03847264940850437