使用Javascript创建<link>元素，然后将其添加到<头部>部分
Using Javascript to create a <link> element and then adding it to <head> section
我试图实现的是使用javascript在部分中编写一个元素。我试图添加的链接元素看起来像这个
<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family=Oswald&effect=neon">
根据要求，我已经发布了整个代码
<!doctype html>
<html>
<head>
<title>Extra-Life Alerts</title>
<meta charset="utf-8">
<link href="singleAlert.css" rel="stylesheet">
<script>
var effect = $.url().param('effect');
var font = $.url().param('font');
/*
//document.getElementById("body").innerHTML = document.write('<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family=' + font + '&effect=' + effect +'">');
//document.getElementById('head').innerHTML += '<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family="' + font + '"&effect="' + effect + '"">';
//var stylesheetAdd = '<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family="' + font + '"&effect="' + effect + '"">';
$(function() {
$('head').append('<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family="' + font + '"&effect="' + effect + '""/>');
});
//var headID = document.getElementsByTagName("head")[0];
//$(headID).append('<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family="' + font + '"&effect="' + effect + '"">');
//document.getElementById('#posts').className = 'font-effect-' + effect;
//document.getElementById('#posts').style.fontFamily = font;
//$("#posts").className("font-effect-" + effect).style.fontFamily(font); //= 'font-effect-' + effect;
//$("#posts").style.fontFamily(font); //= font;
//if (font) { $('.wf-active body, .wf-inactive body, #posts, body').css('font-family', font); }
//else{font="Impact"; $('.wf-active body, .wf-inactive body, #posts, body').css('font-family', font);}
*/
/*
//$('head').append('<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family="' + font + '"&effect="' + effect + '""/>');
var stylesheetAdd = '<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family="'+font+'"&effect="'+effect+'"">';
//$('head').append('<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family=Oswald&effect=neon" />');
$(stylesheetAdd).appendTo(document.head);
*/
var headID = document.getElementsByTagName('head')[0];
var link = document.createElement('link');
link.type = 'text/css';
link.rel = 'stylesheet';
link.href = 'http://fonts.googleapis.com/css?family=Oswald&effect=neon';
headID.appendChild(link);
/*
var link = $('<link />')
.appendTo(document.getElementsByTagName('head')[0])
.attr('rel', "stylesheet")
.attr('type', "text/css")
.attr('href', "http://fonts.googleapis.com/css?family=Oswald&effect=neon");
$(function(){
$(link);
});
*/
</script>
<!--<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family=Oswald&effect=neon">-->
</head>
<body>
<!--<script src="https://ajax.googleapis.com/ajax/libs/webfont/1.5.18/webfont.js"></script>-->
<script src="http://code.jquery.com/jquery-2.1.4.js"></script>
<script src="./javascript/jQuery-url-parser/2.3.1/purl.js"></script>
<script src="./javascript/dropzone/dropzone.js"></script>
<script>
var checkPriorDonorName = "prior name";
var getCurrentDonorName = "current name";
var checkPriorMessage = "prior message";
var getCurrentMessage = "current message";
function init() {
// Parse setup parameters.
var id = $.url().param('id');
var audio = $.url().param('audio');
var playAudio = document.createElement("AUDIO");
var xmlhttp = new XMLHttpRequest();
//var url = "http://2dc8c656ef.test-url.ws/tempDonations.txt";
var url = "http://www.extra-life.org/index.cfm?fuseaction=donorDrive.participantDonations&participantID=" + id + "&format=json";
xmlhttp.open("GET", url, true);
xmlhttp.send();
xmlhttp.onreadystatechange = function () {
getCurrentDonorName = xmlhttp.responseText;
getCurrentMessage = xmlhttp.responseText
};
getCurrentDonorName = JSON.parse(getCurrentDonorName);
getCurrentMessage = JSON.parse(getCurrentMessage);
xmlhttp.onreadystatechange = function () {
if ((xmlhttp.readyState == '4' && ( xmlhttp.status == '200' || xmlhttp.status == '204' )) &&
( checkPriorDonorName === "prior name" || getCurrentDonorName[0].donorName != checkPriorDonorName ) &&
( checkPriorMessage === "prior message") || getCurrentMessage[0].message != checkPriorMessage) {
extraLifeAlert(xmlhttp.responseText);
}
else
return;
};
/** Debugging steps
console.log("TEST BEGINNING NAME: Current: " + getCurrentDonorName[0].donorName + " | Prior: " + checkPriorDonorName);
console.log("TEST BEGINNING MESSAGE: Current: " + getCurrentMessage[0].message + " | Prior: " + checkPriorMessage);
*/
function extraLifeAlert(response) {
var donorName = JSON.parse(response);
var message = JSON.parse(response);
var donationAmount = JSON.parse(response);
if (donorName[0].donorName) {
$('#posts').find('.donorName').text(donorName[0].donorName);
}
if (donationAmount[0].donationAmount) {
$('#posts').find('.donationAmount').text(donationAmount[0].donationAmount);
}
if (message[0].message !== null) {
$('#posts').find('.message').text(message[0].message);
}
else {
$("#posts").find(".message").text("");
}
//setTimeout(function(){document.getElementById('#posts').attr('style', 'display: none')}, 0);
//setTimeout(function(){document.getElementById('#posts').attr('style', 'display: inline')}, 2000);
setTimeout(function () {
document.getElementById('#posts').style.display = 'none'
}, 0);
setTimeout(function () {
document.getElementById('#posts').style.display = 'inline'
}, 2000);
if (audio) {
playAudio.setAttribute("src", audio);
playAudio.load();
playAudio.play();
}
setTimeout(function () {
$("#posts").fadeIn(1000);
}, 1000);
setTimeout(function () {
$("#posts").fadeOut(1000);
}, 10000);
checkPriorDonorName = donorName[0].donorName;
checkPriorMessage = message[0].message;
}
}
/** Debugging steps
console.log("TEST END NAME: Current: " + getCurrentDonorName[0].donorName + " | Prior: " + checkPriorDonorName);
console.log("TEST END MESSAGE: Current: " + getCurrentMessage[0].message + " | Prior: " + checkPriorMessage);
*/
setInterval(init, 5000);
</script>
<div id="posts" style="display:none;font-family: Oswald;" class="font-effect-neon">
<div id="donationMessage"><span class="donorName"></span> Just donated $<span class="donationAmount"></span>.00 - <span class="message"></span></div>
</div>
<!--
<script>
$("#posts").addClass = ( "font-effect-" + effect );
/*.style.fontFamily(font);/*
.style.fontFamily(font); //= 'font-effect-' + effect;
$("#posts").find(".messages").append( $("#posts").hasClass("font-effect-neon").toString() );
*/
</script>
<!--
<script>
//var font = $.url().param('font');
//var reload = $.url().param('reload', false);
//var reloadTime = $.url().param('reloadTime');
/* Load Googles Webfont API*/
WebFont.load({
google: {
families: [font]
}
});
if (font) {
$(".wf-active body, .wf-inactive body, #posts").css("font-family", font);
}
else {
font = "Impact";
$(".wf-active body, .wf-inactive body, #posts").css("font-family", font);
}
//if(reload){setInterval(function(){location.reload(true);}, reloadTime);}
</script>-->
</body>
</html>
Opps认为我剪切并粘贴了一些东西。因此，要想让这种谷歌字体+效果发挥作用，唯一重要的想法是：1）在中添加标记，2）添加字体&effect类。现在我手动输入它用于测试。我计划通过脚本控制所有这些，这样用户就可以将选项放在url中并使其工作。
这是有效的：
var fontLoader = function (param) {
var link = document.createElement('link');
link.type = 'text/css';
link.rel = 'stylesheet';
//link.href = 'http://fonts.googleapis.com/css?family=Oswald&effect=neon';
document.head.appendChild(link);
link.href = 'http://fonts.googleapis.com/css?family=' + param.family + '&effect=' + param.effect;
};
fontLoader({
family: 'Oswald',
effect: 'neon'
});.normal , .oswald {
padding : 3px;
margin : 3px;
color : #333;
border : solid 1px #CCC;
font-size : 2em;
}
.oswald {
font-family:'Oswald';
}<div class='normal'>Normal Style</div>
<div class='oswald'>Oswald Style</div>只要在你的身体末端尝试这个代码。
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