Meta charset="UTF-8"> @H_404_6@ function getClass(node,classname) { if(node.getElementsByClassName) { return node.getElementsByClassName(classname); //如果存在该标签 就返回 } else { var elems = node.getElementsByTagName(node),defualt = []; for (var i = 0; i < elems.length; i++) { //遍历所有标签 if(elems[i].className.indexOf(classname) != -1) { //查找相应类名的标签 defualt[defualt.length] = elems[i]; } } return defualt; } } window.onload = function () { var text = document.getElementById('text'),cs = getClass(text,'cs'); document.write(cs.innerHTML='cs'); }