getElemntById里如何放变量？

Question

        function $id(id)

            {return document.getElementById(id);};

        

        for(x = 1;x < 4;x++)

        {                

            $id("button_img_"+x).addEventListener("click",slide_button);    

        }

如上述代码，id需要被遍历，如何让document.getElementById("id")里的id为变量？

谢谢

Answer 1

你现在这样遍历没有问题呀，这样可以传一个变量id进去。function $id(id) {&nbsp; &nbsp; return document.getElementById(id);};for (x = 1; x < 4; x++) {&nbsp; &nbsp; (function(x){&nbsp; &nbsp; &nbsp; &nbsp; $id("button_img_" + x).addEventListener("click", function() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; alert(x);&nbsp; &nbsp; &nbsp; &nbsp; });&nbsp; &nbsp; }(x))}