vue组件引入外部js同时获取变量
引入文件支持加载成功回调，支持通过字符串变量名获取js文件的变量
/*** 引入js文件 并且获取变量* @param src js路径* @param variableName 需要获取的变量名* @param callback*/export const importJs = (src, variableName = '', callback = '') => {if (!isInclude(src)) {// 避免重复引入const script = document.createElement('script')script.type = 'text/JavaScript'script.src = srcdocument.body.appendChild(script)if (typeof callback === 'function') {script.onload = script.onreadystatechange = function() {if (!script.readyState || /loaded|complete/.test(script.readyState)) {script.onload = script.onreadystatechange = null // 避免重复触发const fn = new Function('return ' + variableName)callback(variableName !== '' ? fn() : '')}}}} else if (typeof callback === 'function') {const fn = new Function('return ' + variableName)callback(variableName !== '' ? fn() : '')}}
// 是否引入资源文件function isInclude(name) {const js = /js$/i.test(name)const es = document.getElementsByTagName(js ? 'script' : 'link')for (let i = 0; i < es.length; i++) {if (es[i][js ? 'src' : 'href'].indexOf(name) !== -1) return true}return false}
