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