作为一个懒人，在JS . 和 []之间总是选择.，今天查资料时，倒是看到了 “点” 和 “括号”的一些区别。这里抛砖引玉一下

先看一个常见例子：

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var obj = { "say" : "hello" };
var x = "say";
var y = obj[x];
console.log(y); // hello    
obj.x  //  undefine

contentType

在上次的项目中有提到，上传文件时，要将contentType和processData都设置为false，现在给出我的理解（轻拍
contentType (default: ‘application/x-www-form-urlencoded; charset=UTF-8’)

When sending data to the server, use this content type. Default is “application/x-www-form-urlencoded; charset=UTF-8”, which is fine for most cases. If you explicitly pass in a content-type to $.ajax(), then it is always sent to the server (even if no data is sent).

写在前面

这是一个比较简单的全栈Demo，写这个的动机主要是：当我查询网上一些nodejs资料时，很少有完整的传输文件的案例，大多是通过前端form 的action属性直接上传，所以萌生了写通过FromData上传图片的案例。功能实现之后做了一些前端展示。算是个比较不错的入门全栈项目。

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