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javascript原生的api本来就支持,Base64,但是由于之前的javascript局限性,导致Base64基本中看不中用。当前html5标准正式化之际,Base64将有较大的转型空间,对于Html5 Api中出现的如FileReader Api, 拖拽上传,甚至是Canvas,Video截图都可以实现。

好了,前言说了一大堆,开发者需要重视:

一.我们来看看,在javascript中如何使用Base64转码

var str = 'javascript';

window.btoa(str)
//转码结果 "amF2YXNjcmlwdA=="

window.atob("amF2YXNjcmlwdA==")
//解码结果 "javascript"

二.对于转码来说,Base64转码的对象只能是字符串,因此来说,对于其他数据还有这一定的局限性,在此特别需要注意的是对Unicode转码。

var str = "China,中国"
window.btoa(str)

Uncaught DOMException: Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range.

很明显,这种方式是不行的,那么如何让他支持汉字呢,这就要使用window.encodeURIComponent和window.decodeURIComponent

var str = "China,中国";

window.btoa(window.encodeURIComponent(str))
//"Q2hpbmElRUYlQkMlOEMlRTQlQjglQUQlRTUlOUIlQkQ="

window.decodeURIComponent(window.atob('Q2hpbmElRUYlQkMlOEMlRTQlQjglQUQlRTUlOUIlQkQ='))
//"China,中国"

 

window.btoa('{"success":true,"msg":null,"errorCode":0,"data":{"memberId":"6976462","canBxMoney":0,"bxdAsset":3000.00,"bxdProfit":95.752732}}');
"eyJzdWNjZXNzIjp0cnVlLCJtc2ciOm51bGwsImVycm9yQ29kZSI6MCwiZGF0YSI6eyJtZW1iZXJJZCI6IjY5NzY0NjIiLCJjYW5CeE1vbmV5IjowLCJieGRBc3NldCI6MzAwMC4wMCwiYnhkUHJvZml0Ijo5NS43NTI3MzJ9fQ=="

window.atob("eyJzdWNjZXNzIjp0cnVlLCJtc2ciOm51bGwsImVycm9yQ29kZSI6MCwiZGF0YSI6eyJtZW1iZXJJZCI6IjY5NzY0NjIiLCJjYW5CeE1vbmV5IjowLCJieGRBc3NldCI6MzAwMC4wMCwiYnhkUHJvZml0Ijo5NS43NTI3MzJ9fQ==")
"{"success":true,"msg":null,"errorCode":0,"data":{"memberId":"6976462","canBxMoney":0,"bxdAsset":3000.00,"bxdProfit":95.752732}}"

 

posted on 2016-06-08 14:10  杜兰德  阅读(7307)  评论(0编辑  收藏  举报