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```js
// 调用接口前判断是否已登录
var openId = localStorage.getItem("openId");
if (openId != null && openId != 'null' && openId != '' && openId !== undefined) {
alert("已登录，你的ID是：" + openId);
window.location.href = 'index.html';
return api;
}
// 轮询登录校验返回
if (payload.data != 'NO_LOGIN' && payload.status == '0') {
localStorage.setItem("openId", payload.data.openId);
alert("扫码已登录成功，你的ID是：" + payload.data.openId);
return payload;
```
