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js跨域的几种解决方案
首先什么是跨域，简单地理解就是因为JavaScript同源策略（同协议，同域名，同端口）的限制，出于安全方面的考虑，不允许跨域调用其他页面的对象。而对于有跨域请求数据的情况有以下几种解决方案：
- jsonp
- document.domain
- window.name
- window.postMessage
- Access-Control-Allow-Origin
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关于js继承那点事
前言
代码复用是一个永恒的主题，而继承就是实现代码复用的途径之一
总的来说，js继承大致分为：
- 类式继承
- 原型继承
- 拷贝继承
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