ES6 数组Map

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    <script>
        //将arr数组的中的所有元素*2
        var arr=[1,2,3,4,5,6,7];

        //传统方法
        let newarr=[];
        for(let i=0;i<arr.length;i++){
            newarr.push(arr[i]*2);
        }
        //console.log(newarr);

        //map--自带循环，并且会把处理的值回填到对应位置
        var newarr2=arr.map((obj)=>{
            return obj*2;
        })
        //console.log(newarr2);

        //map处理对象数组
        var students=[{age:17,name:"小亮"},{age:20,name:"小黑"},{age:22,name:"琳琳"}];
        var newstudents=students.map(function(obj){
            obj.age=obj.age+1;
            obj.school="THU";
            return obj;
        });
        console.log(newstudents);
    </script>
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