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let callbacks = []
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function loadSuccess(key) {
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// to fixed https://github.com/PanJiaChen/vue-element-admin/issues/2144
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// check is successfully downloaded script
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return window[key]
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}
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const load = (src, type, callback) => {
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if(type=='link'){
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loadStyle(src, callback)
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}else{
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let loadKey = ''
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if(src.indexOf('tinymce')>=0){
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loadKey = 'tinymce'
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}else if(src.indexOf('codemirror')>=0){
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loadKey = 'CodeMirror'
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}
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const scriptTag = document.getElementById(src)
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//const cb = callback || function() {}
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if (!scriptTag) {
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const script = document.createElement('script')
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script.src = src // src url for the third-party library being loaded.
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script.id = src
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script.onload=()=>callback()
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script.onerror=()=>callback('加载失败：'+src)
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document.body.appendChild(script)
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//callbacks.push(cb)
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// const onEnd = 'onload' in script ? stdOnEnd : ieOnEnd
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// onEnd(script)
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}else{
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if (loadSuccess(loadKey)) {
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callback()
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}
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}
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if (scriptTag) {
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/* else {
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callbacks.push(cb)
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}*/
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}
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}
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function stdOnEnd(script) {
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script['onload'] = function() {
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// this.onload = null here is necessary
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// because even IE9 works not like others
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this.onerror = this.onload = null
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for (const cb of callbacks) {
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cb(null, script)
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}
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callbacks = null
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}
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script['onerror'] = function() {
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this.onerror = this.onload = null
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cb(new Error('Failed to load ' + src), script)
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}
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}
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function ieOnEnd(script) {
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script.onreadystatechange = function() {
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if (this.readyState !== 'complete' && this.readyState !== 'loaded') return
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this.onreadystatechange = null
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for (const cb of callbacks) {
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cb(null, script) // there is no way to catch loading errors in IE8
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}
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callbacks = null
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}
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}
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function loadStyle(src, callback) {
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const link = document.getElementById(src)
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if (!link) {
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const link = document.createElement('link')
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link.setAttribute("rel", "stylesheet");
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link.setAttribute("type", "text/css");
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link.setAttribute("href", src);
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link.id = src
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let heads = document.getElementsByTagName("head")
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if(heads.length){
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heads[0].appendChild(link)
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}else{
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document.documentElement.appendChild(link)
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}
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}
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callback();
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}
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}
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export default load
|
