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通常项目开发中我们通常会遇到跨域调用，然后当请求调用的时候会遇到这个错
No 'Access-Control-Allow-Origin' header is present on the requested resource.
通常解决这个错误有两种解决方法
1. JSONP
2. CORS
Note:
CORS与JSONP相比，更为先进、方便和可靠。
- JSONP只能实现GET请求，而CORS支持所有类型的HTTP请求。
- 使用CORS，开发者可以使用普通的XMLHttpRequest发起请求和获得数据，比起JSONP有更好的错误处理。
- JSONP主要被老的浏览器支持，它们往往不支持CORS，而绝大多数现代浏览器都已经支持了CORS。
但是呢，现在你的项目还是在开发阶段，比如技术选型POC阶段，用不着搞得这么复杂，所以最简单的方法就是在Chrome中安装一个插件Allow-Control-Allow-Origin，可以快而有效的解决这类问题。
安装后
开启CORS，再次调试跨域调用，错误就没有了
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