ES6中的数组方法( map )

        var arr = [1,2,3,4,5]
        var doubleNumber = arr.map(function(num){
            return num*2
        })    
　　　　　console.log(doubleNumber) //[2,4,6,8,10]　

var arr = [
            {
                name:‘Jack‘,age:‘16‘,sex:‘男‘     
            },{
                name:‘Jerry‘,age:‘18‘,sex:‘男‘    
            },{
                name:‘Bailey‘,age:‘14‘,sex:‘女‘    
            }
        ]
 var names = arr.map(function(name){
            return name.name;
        })
 console.log(names) //  ["Jack", "Jerry", "Bailey"]