//修改了一个bug,增加了手动释放垃圾
<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>jsonp跨域源码插件封装</title>
</head><body><input type="text" id="code"><input type="button" value="查询" id="serch"><script>; (function (win) {const jsonp = function (dataPack) {const callback = dataPack.callBack || '';const code = dataPack.code || 'sh000001';const getUrl = 'http://hq.sinajs.cn/list=' + code;let scriPt = document.createElement('script');scriPt.src = getUrl;scriPt.id = 'xl';const oldScript = document.getElementById('xl');const success = function () {const val = eval('hq_str_' + code);//手动垃圾回收for (let i in window) {if (/^hq_str_/.test(i)) {window[i] = null;}}callback && callback(val);}const error = function () {callback && callback('跨域发生了错误！');}if (oldScript) {document.body.removeChild(oldScript);document.body.appendChild(scriPt);} else {document.body.appendChild(scriPt);}scriPt.onload = success;scriPt.onerror = error;}win.jsonp = jsonp;})(window);document.querySelector('#serch').addEventListener('click', function () {jsonp({code: document.querySelector('#code').value,callBack: function (data) {console.log(data);}});})</script>
</body></html>
 解析)
