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。
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