使用Post提交时须将空格转换成加号的解释

 更新时间:2013年01月14日 17:20:02   转载 作者:  
参数有中包含空格且使用Post提交时须将空格转换成加号,这样后台程序接受到的才是真正的空格,感兴趣的朋友可以了解下
jQuery的serialize模块中有个r20正则
复制代码 代码如下:

var r20 = /%20/g,

jQuery.param方法中会将所有的"%20"转成"+",即提交数据前,数据中如果包含空格,那经过encodeURIComponent后,空格会转成"%20"
复制代码 代码如下:

encodeURIComponent(' ') === '%20'; // true

最后需要将"%20"转换成"="再Post提交。这样后台程序接受到的才是真正的空格。

关于 encodeURIComponent,见MDC描述

encodeURIComponent escapes all characters except the following: alphabetic, decimal digits, - _ . ! ~ * ' ( )

To avoid unexpected requests to the server, you should call encodeURIComponent on any user-entered parameters that will be passed as part of a URI. For example, a user could type "Thyme &time=again" for a variable comment. Not using encodeURIComponent on this variable will give comment=Thyme%20&time=again. Note that the ampersand and the equal sign mark a new key and value pair. So instead of having a POST comment key equal to "Thyme &time=again", you have two POST keys, one equal to "Thyme " and another (time) equal to again.

For application/x-www-form-urlencoded (POST), per http://www.w3.org/TR/html401/interac...m-content-type, spaces are to be replaced by '+', so one may wish to follow a encodeURIComponent replacement with an additional replacement of "%20" with "+".

相关
https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/encodeURIComponent
http://www.w3.org/TR/html401/interact/forms.html#form-content-type

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