今天在做app返回from之前的页面时遇到了被转义的url地址，像http://m.test.com/login?from=http%3A%2F%2Fapp.test.com这样的。通过观察可以知道， : 被转义成了 %3A，/ 被转义成了%2F。现在我需要的是将URL参数里已经转义的字符串给解析成转义之前的样子。
JS中有提供转义字符串和解析字符串的方法。
encodeURIComponent:转义字符串
let url = 'http%3A%2F%2Fm.test.com%2Flogin'
encodeURIComponent(url)
// http://m.test.com/login
decodeURIComponent:解析字符串
let url = 'http://m.test.com/login'
encodeURIComponent(url)
// 'http%3A%2F%2Fm.test.com%2Flogin'
http://readmodel.m.sogou.com/read?url=http%3A%2F%2Fm.5577...
http://www.pingyu.gov.cn/index.php?keywords=http%3A%2F%2F...
http://m.so.com/index.php?a=newTranscode&u=http%3A%2F%2Fw...
原文：PDF: Objective-C Internals[http%3A%2F%2Falgorithm.com....
wget --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.co...
https://gxb.mmstat.com/gxb.gif?t=http%3A%2F%2Fequity-vip....
伙伴们在雅思[https://link.zhihu.com/?target=http%3A%2F%2Fclass....
dps://p?url=http%3A%2F%2Fmclick.simba.taobao.com%2Fcc_im%...
https://link.jianshu.com/?t=http%3A%2F%2Fm.iqiyi.com%2Fw_...
https://zm6.sm-tc.cn/?spm=0.0.0.0.6CFHFQ&src=http%3A%2F%2...
本文标题：当“http://”被转义成字符串“http%3A%2F%2F”
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