2 回答function $(id){return typeof id==='string'?document.getElementsById(id):id;}，

7 回答function $(id){ return typeof id==='string'?document.getElementById(id):id; }

5 回答function $(id){ return typeof id==='string'?document.getElementById(id):id; }

1 回答function $(id){ return typeof id==="string"?document.getElementById("id"):id}

3 回答function $(id) { return typeof id==='string' ? document.getElementById(id):id;這行代碼有什么用？？？