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Javascript 如何在单击时更改CSS链接<；a>；标签？

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Javascript 如何在单击时更改CSS链接<；a>；标签？,javascript,jquery,html,css,anchor,Javascript,Jquery,Html,Css,Anchor,我已经尝试了几个小时让我的锚定标签工作，如果点击，它会改变指向颜色主题CSS的链接的href 这是我到目前为止得到和发现的。 我只是想把它改成红色的主题 html（在列表标记之间删除空格，以防止内联块造成的视觉空白） 链接标签可以工作，只是在我点击链接时它的href没有改变（单击此处更改： onclick="applyCSS('css/theme_red.css'); return false;" 当前，在运行applyCSS之后，它会跟随链接并刷新页面。“return false”将阻止这种

我已经尝试了几个小时让我的锚定标签工作，如果点击，它会改变指向颜色主题CSS的链接的
href

这是我到目前为止得到和发现的。 我只是想把它改成红色的主题

html（在列表标记之间删除空格，以防止
内联块造成的视觉空白
）

链接标签可以工作，只是在我点击链接时它的
href
没有改变（

单击此处更改：

onclick="applyCSS('css/theme_red.css'); return false;"
当前，在运行applyCSS之后，它会跟随链接并刷新页面。“return false”将阻止这种行为。

下面的示例向您展示如何做到这一点，这很好，因为即使刷新，它也会停留在您选择的最后一个主题上

<html>
<head>
<link href="style1.css" media="all" rel="stylesheet" type="text/css" />
<link href="style2.css" media="screen" rel="alternate stylesheet" title="style2" type="text/css" />
<link href="style3.css" media="screen" rel="alternate stylesheet" title="style3" type="text/css" />
<script src="BCo.js" type="text/javascript"></script>
</head>
<body>
<ul>
<li>
<a href="javascript:chooseStyle('style1',60)" target="_self" >1</a>
</li>
<li>
<a href="javascript:chooseStyle('style2',60)" target="_self" >2</a>
</li>
<li>
<a href="javascript:chooseStyle('style3',60)" target="_self">3</a>
</li>
</ul>
<h1>test</h1>
</body>
</html>
style2.css代码

h1 {
color: #7c7c7c;
}
您可以尝试一种PHP方法

switch ($theme) {
  case 'red':
  $theme_file = 'red.css';
  break;

  case 'blue':
  $theme_file = 'blue.css';
  break;

  default:
  $theme_file = 'red.css';

}
然后使用HTML，您只需要：

<a href="?theme=red">Red</a>
<a href="?theme=blue">Blue</a>
如果你可以用这种方法设置cookies，这样当用户返回时，主题就会被记住，或者如果你正在使用数据库，你可以将其永久存储。

这是什么魔法？谢谢你，伙计。我很想升级投票，但似乎我需要更多的声誉。对不起，我忘了添加现在添加的js代码测试，希望它能工作正如你所希望的，也只是为了以防万一你想做快速检查，这里是style1.css和style2的代码。cssI不想深入研究javascript。但我确实注意到它在刷新后会消失。谢谢你的回答。这将是未来的参考。欢迎你。我使用Chrom和IE检查过，但即使在我刷新或ev之后en当我再次打开页面时关闭浏览器后，它具有我选择的最后一种样式1。这不是PHP问题。2.您没有提供
$theme
来自何处的完整解释（并且不应依赖于） 
var manual_or_random="manual" //"manual" or "random"
var randomsetting="3 days" //"eachtime", "sessiononly", or "x days (replace x with desired integer)". Only applicable if mode is random.

//////No need to edit beyond here//////////////

function getCookie(Name) { 
var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
if (document.cookie.match(re)) //if cookie found
return document.cookie.match(re)[0].split("=")[1] //return its value
return null
}

    function setCookie(name, value, days) {
var expireDate = new Date()
//set "expstring" to either future or past date, to set or delete cookie, respectively
var expstring=(typeof days!="undefined")? expireDate.setDate(expireDate.getDate()+parseInt(days)) : expireDate.setDate(expireDate.getDate()-5)
document.cookie = name+"="+value+"; expires="+expireDate.toGMTString()+"; path=/";
}

function deleteCookie(name){
setCookie(name, "moot")
}


function setStylesheet(title, randomize){ //Main stylesheet switcher function. Second parameter if defined causes a random alternate stylesheet (including none) to be enabled
var i, cacheobj, altsheets=[""]
for(i=0; (cacheobj=document.getElementsByTagName("link")[i]); i++) {
if(cacheobj.getAttribute("rel").toLowerCase()=="alternate stylesheet" && cacheobj.getAttribute("title")) { //if this is an alternate stylesheet with title
cacheobj.disabled = true
altsheets.push(cacheobj) //store reference to alt stylesheets inside array
if(cacheobj.getAttribute("title") == title) //enable alternate stylesheet with title that matches parameter
cacheobj.disabled = false //enable chosen style sheet
}
}
if (typeof randomize!="undefined"){ //if second paramter is defined, randomly enable an alt style sheet (includes non)
var randomnumber=Math.floor(Math.random()*altsheets.length)
altsheets[randomnumber].disabled=false
}
return (typeof randomize!="undefined" && altsheets[randomnumber]!="")? altsheets[randomnumber].getAttribute("title") : "" //if in "random" mode, return "title" of randomly enabled alt stylesheet
}

function chooseStyle(styletitle, days){ //Interface function to switch style sheets plus save "title" attr of selected stylesheet to cookie
if (document.getElementById){
setStylesheet(styletitle)
setCookie("mysheet", styletitle, days)
}
}

function indicateSelected(element){ //Optional function that shows which style sheet is currently selected within group of radio buttons or select menu
if (selectedtitle!=null && (element.type==undefined || element.type=="select-one")){ //if element is a radio button or select menu
var element=(element.type=="select-one") ? element.options : element
for (var i=0; i<element.length; i++){
if (element[i].value==selectedtitle){ //if match found between form element value and cookie value
if (element[i].tagName=="OPTION") //if this is a select menu
element[i].selected=true
else //else if it's a radio button
element[i].checked=true
break
}
}
}
}

if (manual_or_random=="manual"){ //IF MANUAL MODE
var selectedtitle=getCookie("mysheet")
if (document.getElementById && selectedtitle!=null) //load user chosen style sheet from cookie if there is one stored
setStylesheet(selectedtitle)
}
else if (manual_or_random=="random"){ //IF AUTO RANDOM MODE
if (randomsetting=="eachtime")
setStylesheet("", "random")
else if (randomsetting=="sessiononly"){ //if "sessiononly" setting
if (getCookie("mysheet_s")==null) //if "mysheet_s" session cookie is empty
document.cookie="mysheet_s="+setStylesheet("", "random")+"; path=/" //activate random alt stylesheet while remembering its "title" value
else
setStylesheet(getCookie("mysheet_s")) //just activate random alt stylesheet stored in cookie
}
else if (randomsetting.search(/^[1-9]+ days/i)!=-1){ //if "x days" setting
if (getCookie("mysheet_r")==null || parseInt(getCookie("mysheet_r_days"))!=parseInt(randomsetting)){ //if "mysheet_r" cookie is empty or admin has changed number of days to persist in "x days" variable
setCookie("mysheet_r", setStylesheet("", "random"), parseInt(randomsetting)) //activate random alt stylesheet while remembering its "title" value
setCookie("mysheet_r_days", randomsetting, parseInt(randomsetting)) //Also remember the number of days to persist per the "x days" variable
}
else
setStylesheet(getCookie("mysheet_r")) //just activate random alt stylesheet stored in cookie
} 
}

h1 {
font-family: Tahoma,arial;
font-size: 18px;
font-weight: bold;
line-height: 20px;
color: #1D828C;
}

h1 {
color: #7c7c7c;
}

switch ($theme) {
  case 'red':
  $theme_file = 'red.css';
  break;

  case 'blue':
  $theme_file = 'blue.css';
  break;

  default:
  $theme_file = 'red.css';

}

<a href="?theme=red">Red</a>
<a href="?theme=blue">Blue</a>