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JSONP原理及简单实现 #6
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同源协议指的是页面若域名,端口,协议都相同,便具有相同的源。
目的是为了保证用户信息的安全,防止恶意的网站窃取数据。
解决这种同源策略的方法便成为跨域。
JSONP是JSON with Padding的略称。允许在服务器端集成Script tags返回至客户端,通过javascript callback的形式实现跨域访问。
利用script标签的src属性调用资源不跨域的特性,向服务端请求同时传一个callback回调方法名作为参数,服务端接受函数名生成返回json格式资源的代码。
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