1、ie8不支持getElementsByClassName()方法
【解决办法】
if(!document.getElementsByClassName){document.getElementsByClassName = function(className, element){var children = (element || document).getElementsByTagName(‘*‘);var elements = new Array();for (var i=0; i<children.length; i++){var child = children[i];var classNames = child.className.split(‘ ‘);for (var j=0; j<classNames.length; j++){if (classNames[j] == className){ elements.push(child);break;}}} return elements;};}2、ie8给函数参数默认值报错
js兼容性汇总
原文地址：https://www.cnblogs.com/liwuming/p/10112024.html