今天出现了一个问题找了好久先看代码：
这可能是个BUG吧插入代码：
dataType: 'jsonp', crossDomain: true,
最终：
Access to XMLHttpRequest at 'XXX' from origin 'XX' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present o AJAX跨域请求解决方法
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