| 提交 | 用户 | age | ||
| 4dde14 | 1 | let callbacks = [] |
| L | 2 | |
| 3 | function loadedTinymce() { | |
| 4 | // to fixed https://github.com/PanJiaChen/vue-element-admin/issues/2144 | |
| 5 | // check is successfully downloaded script | |
| 6 | return window.tinymce | |
| 7 | } | |
| 8 | ||
| 9 | const dynamicLoadScript = (src, callback) => { | |
| 10 | const existingScript = document.getElementById(src) | |
| 11 | const cb = callback || function() {} | |
| 12 | ||
| 13 | if (!existingScript) { | |
| 14 | const script = document.createElement('script') | |
| 15 | script.src = src // src url for the third-party library being loaded. | |
| 16 | script.id = src | |
| 17 | document.body.appendChild(script) | |
| 18 | callbacks.push(cb) | |
| 19 | const onEnd = 'onload' in script ? stdOnEnd : ieOnEnd | |
| 20 | onEnd(script) | |
| 21 | } | |
| 22 | ||
| 23 | if (existingScript && cb) { | |
| 24 | if (loadedTinymce()) { | |
| 25 | cb(null, existingScript) | |
| 26 | } else { | |
| 27 | callbacks.push(cb) | |
| 28 | } | |
| 29 | } | |
| 30 | ||
| 31 | function stdOnEnd(script) { | |
| 32 | script.onload = function() { | |
| 33 | // this.onload = null here is necessary | |
| 34 | // because even IE9 works not like others | |
| 35 | this.onerror = this.onload = null | |
| 36 | for (const cb of callbacks) { | |
| 37 | cb(null, script) | |
| 38 | } | |
| 39 | callbacks = null | |
| 40 | } | |
| 41 | script.onerror = function() { | |
| 42 | this.onerror = this.onload = null | |
| 43 | cb(new Error('Failed to load ' + src), script) | |
| 44 | } | |
| 45 | } | |
| 46 | ||
| 47 | function ieOnEnd(script) { | |
| 48 | script.onreadystatechange = function() { | |
| 49 | if (this.readyState !== 'complete' && this.readyState !== 'loaded') return | |
| 50 | this.onreadystatechange = null | |
| 51 | for (const cb of callbacks) { | |
| 52 | cb(null, script) // there is no way to catch loading errors in IE8 | |
| 53 | } | |
| 54 | callbacks = null | |
| 55 | } | |
| 56 | } | |
| 57 | } | |
| 58 | ||
| 59 | export default dynamicLoadScript | |
