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| HTMLScriptElement
| HTMLLinkElement
| HTMLStyleElement
| HTMLImageElement
/**
* 资源类型。
*
* @public
*/
export enum LoadResourceUrlType {
/** 样式资源 */
css = 'css',
/** 样式文本 */
cssText = 'cssText',
/** 代码资源 */
js = 'js',
/** 代码文本 */
jsText = 'jsText',
/** 图片资源 */
img = 'img',
}
export type LoadResourceHook = (el: LoadResourceElement) => any
/**
* 资源地址。
*
* @public
*/
export interface LoadResourceUrl {
/** 资源类型 */
type: LoadResourceUrlType
/** 资源路径 */
path: string
/** 备用资源路径 */
alternatePath?: string
/** 钩子 */
hook?: LoadResourceHook
}
export interface LoadResourceOptions {
/** 钩子 */
hook?: LoadResourceHook
}
function loadSpecificResource(
url: LoadResourceUrl,
): Promise<LoadResourceElement> {
return new Promise((resolve, reject) => {
let el!: LoadResourceElement
switch (url.type) {
case LoadResourceUrlType.js:
{
const _el = document.createElement('script')
_el.src = url.path
_el.async = true
el = _el
}
break
case LoadResourceUrlType.jsText:
{
const _el = document.createElement('script')
_el.setAttribute('type', 'text/javascript')
_el.textContent = url.path
el = _el
}
break
case LoadResourceUrlType.css:
{
const _el = document.createElement('link')
_el.rel = 'stylesheet'
_el.href = url.path
el = _el
}
break
case LoadResourceUrlType.cssText:
{
const _el = document.createElement('style')
_el.setAttribute('type', 'text/css')
_el.textContent = url.path
el = _el
}
break
case LoadResourceUrlType.img:
{
const _el = document.createElement('img')
_el.src = url.path
el = _el
}
break
/* istanbul ignore next */
default:
break
}
if (url.hook) {
url.hook(el)
}
el.onload = () => resolve(el)
el.onerror = () => {
if (url.alternatePath) {
loadSpecificResource({
type: url.type,
path: url.alternatePath,
}).then(resolve, reject)
} else {
reject(el)
}
}
if (url.type !== LoadResourceUrlType.img) {
document.head.appendChild(el)
}
})
}
/**
* 加载图片、代码、样式等资源。
*
* @public
* @param url 要加载的资源地址
* @param options 选项
* @returns 返回各资源的 HTML 元素组成的数组
* @example
* ```typescript
* loadResource([
* 'https://foo.bar/all.js',
* 'https://foo.bar/all.css',
* 'https://foo.bar/logo.png',
* {
* type: LoadResourceUrlType.js,
* path: 'https://s1.foo.bar/js/full',
* alternatePath: 'https://s2.foo.bar/js/full',
* },
* ]).then(() => {
* // 资源加载完成后的操作
* })
* ```
*/
export function loadResource(
url: string | LoadResourceUrl | Array<string | LoadResourceUrl>,
options?: LoadResourceOptions,
): Promise<Array<LoadResourceElement>> {
const urls = (Array.isArray(url) ? url : [url]).map<LoadResourceUrl>(item => {
return !(typeof item === 'string')
? item
: {
type: /\.css$/i.test(item)
? LoadResourceUrlType.css
: /\.(png|jpg|jpeg|gif|svg)$/i.test(item)
? LoadResourceUrlType.img
: LoadResourceUrlType.js,
path: item,
}
})
return Promise.all(
urls.map(url =>
loadSpecificResource({
...url,
hook: el => {
options?.hook?.(el)
url.hook?.(el)
},
}),
),
)
}
|