对于js中通过 '.'添加元素的实现以及访问

// if (true){var b = function (){}}
let b = []
b[0]="adfa"
b.a=1
b[1]="adfa"
console.log(b)
for(let ele of b){
    console.log(ele)
}
console.log("________________________________________________")
for(let ele in b){
    console.log(ele)
}
console.log("________________________________________________")

b.forEach((element,index) => {
    console.log(element,index)
});

输出结果

[ 'adfa', 'adfa', a: 1 ]
adfa
adfa
________________________________________________
0
1
a
________________________________________________
adfa 0
adfa 1