记录node知识点
注册登陆: md5加密、与数据库链接、对于post和get请求的处理以及数据验证,对于缓存的运用
图片上传:通过FormData对象的运用,完成对与图片的上传
上传进度条:主要是通过xhr.upload的onprogress方法获取上传的进度,完成进度条展示,加了进度条服务端会接受到两个请求一个是OPTIONS一个是POST,只有POST传输数据
POST:主要是自己犯得一些大意的错误,POST传递给后台是由POST和OPTIONS两个方法的,还有就是关于跨域的头的问题.
spider:爬虫就是将页面代码拿下来，然后将数据拿出来
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记录node知识点
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