//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>