//使用for..in循環(huán)遍歷對象屬性
varperson={
name: "Admin",
age: 21,
address:"shandong"
};
for(vari in person){
console.log(i);
}

//使用for..in循環(huán)遍歷數(shù)組
vararray = ["admin","manager","db"]
for(vari in array){
console.log(i);
}

var array =["admin","manager","db"];
//給Array的原型添加一個name屬性
Array.prototype.name= "zhangsan";
for(var i in array){
alert(array[i]);
}

vararray = ["admin","manager","db"];
//給Array的原型添加一個name屬性
Array.prototype.name = "zhangsan";
for(var i =0 ; i<array.length; i++){
alert(array[i]);
};

vararray = ["admin","manager","db"];
Array.prototype.name= "zhangshan";
for(vari in array){
//如果不是該對象自身直接創(chuàng)建的屬性（也就是該屬//性是原型中的屬性），則跳過顯示
if(!array.hasOwnProperty(i)){
continue;
}
alert(array[i]);
}