什么是jsonp？了解jsonp之前不得不提浏览器的同源策略，现代浏览器使用了同源策略（即域名，协议，端口都相同），即不允许访问非同源的页面。而jsonp就是为了解决跨域问题而生的。它利用script标签的src属性不受同源策略的影响，可在浏览器端动态创建script标签，src指向要访问的API，并提供一个回调函数（函数名为API里的参数）来接收服务器返回来的数据，这样浏览器会调用回调函数，可函处理函数里返回的数据。
jsonp-'s Introduction
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