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lzhe

2024-06-05 fc15f2e904fade9e1505bad70b29829d7d99c124

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/**
 * loadJS 异步加载远程JS
 * @constructor
 * @param {string} src - 必填，需要加载的URL路径
 * @param {string} keyName - 必填，唯一key和JS返回的全局的对象名
 * @param {string} callbackName - 非必填，如果远程JS有callback，则可更有效的判断是否完成加载
 */
export function loadJS (src, keyName, callbackName) {
    return new Promise((resolve, reject) => {
        let has = document.head.querySelector("script[loadKey="+keyName+"]")
        if(has){
            return resolve(window[keyName])
        }
        let script = document.createElement("script")
        script.type = "text/javascript"
        script.src = src
        script.setAttribute("loadKey", keyName)
        document.head.appendChild(script)
        script.onload = () => {
            if(callbackName){
                window[callbackName] = () => {
                    return resolve(window[keyName])
                }
            }else{
                setTimeout(()=>{
                    return resolve(window[keyName])
                },50)
            }
        }
        script.onerror = (err) => {
            return reject(err)
        }
    })
}
 
/**
 * loadCSS 异步加载远程css
 * @constructor
 * @param {string} src - 必填，需要加载的URL路径
 * @param {string} keyName - 必填，唯一key
 */
export function loadCSS (src, keyName) {
    return new Promise((resolve, reject) => {
        let has = document.head.querySelector("link[loadKey="+keyName+"]")
        if(has){
            return resolve()
        }
        let link = document.createElement('link')
        link.rel = "stylesheet"
        link.href = src
        link.setAttribute("loadKey", keyName)
        document.head.appendChild(link)
        link.onload = () => {
            return resolve()
        }
        link.onerror = (err) => {
            return reject(err)
        }
    })
}