虽然很少用，但是还是用到了
自己改的/**
* yloader
* 动态加载 js css
* 用法
*
* var yloader = new yloader();
*
* 1. 动态加载js
* yloader.use('http://xxx.com/static/js/jquery.js');
* 2. 动态加载js后执行方法
* yloader.use('http://xxx.com/static/js/jquery.js', function(){...});
* 3. 动态加载css
* yloader.use('http://xxx.com/static/css/home.css');
*/
function yloader() {
this.doc = document;
this.is_css_reg = /\.css(?:\?|$)/i;
this.ready_state_reg = /^(?:loaded|complete|undefined)$/;
// bug fix
// `onload` event is not supported in webkit // ref:
// - https://bugs.webkit.org/show_activity.cgi?id=38995
// - https://bugzilla.mozilla.org/show_bug.cgi?id=185236
// - https://developer.mozilla.org/en/html/element/link#stylesheet_load_events
this.isoldwebkit = (window.navigator.useragent.replace(/.*applewebkit\/(\d+)\..*/, $1)) * 1 // for some cache cases in ie 6-8, the script executes immediately after
// the end of the insert execution, so use `currentlyaddingscript` to
// hold current node
this.currentlyaddingscript = '';
this.head = this.doc.getelementsbytagname('head')[0];
// ref: #185 & http://dev.jquery.com/ticket/2709
this.baseelement = this.head.getelementsbytagname(base)[0];
}
yloader.prototype = {
constructor : yloader
,isfunction : function(fn) {
return [object function] === object.prototype.tostring.call(fn);
}
,pollcss : function(node, callback) {
var _self = this;
var sheet = node.sheet;
var isloaded = false;
// for webkit if(_self.isoldwebkit) {
if(sheet) {
isloaded = true;
}
} else {
if (sheet) { // for firefox try {
if(sheet.cssrules) {
isloaded = true;
}
} catch (ex) {
// the value of `ex.name` is changed from ns_error_dom_security_err
// to securityerror since firefox 13.0. but firefox is less than 9.0
// in here, so it is ok to just rely on ns_error_dom_security_err
if(ex.name === ns_error_dom_security_err) {
isloaded = true;
}
}
}
}
settimeout(function() {
if (isloaded) {
// place callback here to give time for style rendering
_self.isfunction(callback) && callback();
} else {
_self.pollcss(node, callback);
}
}, 50);
}
,addonload : function(node, callback, iscss) {
var _self = this;
var missingonload = iscss && (_self.isoldwebkit || !(onload in node));
// for old webkit and old firefox
if(missingonload) {
settimeout(function() {
_self.pollcss(node, callback);
}, 10); // begin after node insertion
return;
}
node.onload = node.onerror = node.onreadystatechange = function() {
if(_self.ready_state_reg.test(node.readystate)) {
// ensure only run once and handle memory leak in ie
node.onload = node.onerror = node.onreadystatechange = null;
// remove the script to reduce memory leak
if(!iscss) {
_self.head.removechild(node);
}
// dereference the node
node = null;
_self.isfunction(callback) && callback();
}
};
}
,use : function(url, callback, charset) {
var iscss = this.is_css_reg.test(url);
var node = this.doc.createelement(iscss ? link : script);
if(undefined != charset) {
node.charset = charset;
}
this.addonload(node, callback, iscss);
if (iscss) {
node.rel = stylesheet;
node.href = url;
} else {
node.async = true;
node.src = url;
}
this.currentlyaddingscript = node;
// ref: #185 & http://dev.jquery.com/ticket/2709
this.baseelement ?
this.head.insertbefore(node, this.baseelement) :
this.head.appendchild(node);
this.currentlyaddingscript = null;
}
};
yloader.js.rar ( 1.64 kb 下载：20 次 )
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