随机载入CSS样式的JS效果实际上很好实现,本文的代码如下,具体思路是用一个默认的CSS样式:default.css。另外再用三个其他名称 的CSS:skin1.css,skin2.css,skin3.css。当然你可以用更多的样式表,随后在载入时进行随机替换,因为最先载入的 default.css样式是直接写在页面上,而JS随机载入的后面CSS文件会覆盖之前的CSS,只要CSS中的元素名称相同即可。
var Init = { //样式表文件目录路径 baseSkinUrl : "/blog/css/skin/", //样式表文件名称列表 styles : "default", "skin1", "skin2", "skin3", //样式cookie的key值 cookieKey : "css9_blog_random_css", //定义方法,获取min至max间的随机数,包含min及max getRandomNum : function(min, max){ return min + Math.floor(Math.random() * (max - min + 1)); }, //定义方法,获取cookie值 getCookie : function(name) { var arr = document.cookie.match(new RegExp("(^| )" + name + "=(^;*)(;|$)")); if (arr != null) { return unescape(arr2); } return null; }, //定义方法,设置cookie值 setCookie : function(sName,sValue,objHours,sPath,sDomain,bSecure){ var sCookie = sName + "=" + encodeURIComponent(sValue); if (objHours) { var date = new Date(); var ms = objHours * 3600 * 1000; date.setTime(date.getTime() + ms); sCookie += ";expires=" + date.toGMTString(); } if (sPath) { sCookie += ";path=" + sPath; } if (sDomain) { sCookie += ";domain=" + sDomain; } if (bSecure) { sCookie += ";secure"; } document.cookie=sCookie; }, //定义方法,通过获取随机数随机加载CSS loadCSS : function(){ var length = this.styles.length, random = this.getRandomNum(0, length-1), cookieStyle = this.getCookie(this.cookieKey), currentStyle = "default"; //如果当前随机取到的样式与cookie中样式相同,则重新计算随机数 while(this.stylesrandom == cookieStyle) { random = this.getRandomNum(0, length-1) } currentStyle = this.stylesrandom; //将新样式存入cookie,cookie有效时间为24小时 this.setCookie(this.cookieKey, currentStyle, 24, "/", "websbook.com", false); //若样式名称不为"default"默认样式,则向<head />标签中写入定制样式 if(currentStyle != "default") { document.write('<link rel="stylesheet" type="text/css" href=http://www.chinaz.com/Design/Pages/"' + this.baseSkinUrl + this.stylesrandom + '.css" />'); } } } Init.loadCSS(); |