forEach遍历小实例

<script>    // forEach    var arr = ['zhangsan','lisi','wangwu'];    arr.forEach(function(value,key){        console.log(value,key);    })    var obj = [        {username:"zhagnsan",age:20,sex:1},        {username:"lisi",age:20,sex:1},        {username:"wangwu",age:20,sex:1},    ];    obj.forEach(function(value,key){        console.log(value['username'],value['age'],value['sex']);    })</script>