Question

js 设定指定div 下的a 的样式，不影响其他。

<div id="m50"><a href...>你好，世界</a><a href...>你好，代码</a></div> function randomColor() { //16进制方式表示颜色0-F var arrHex = ["0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"]; var strHex = "#"; var index; for(var i = 0; i < 6; i++) { //取得0-15之间的随机整数 index = Math.round(Math.random() * 15); strHex += arrHex[index]; } return strHex; } function changeColor(){ var links = document.getElementsByTagName("a"); for(var i=0;i<links.length;i++){ var bgColor = randomColor();//改变背景色的代码，根据修去修改。 links[i].style.backgroundColor = bgColor; } } 我现在弄的会影响全局，如何只设置这个div下的a的样式?

Answer 1

只需把这个改改就可以了
var
links
=
document.getElementById('m50').getElementsByTagName("a");
//获取id为m50下的a标签