javascript使用btoa和atob来进行Base64转码和解码

 let str = ‘javascript‘;
 let btoaStr = window.btoa(str);  //转码结果 amF2YXNjcmlwdA==
 console.log(btoaStr);
 console.log(window.atob(btoaStr)); //解码结果 javascript

var str = "China，中国"; 
window.btoa(str) ;

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

let str = ‘javascript,博客‘;
let btoaStr = window.btoa(window.encodeURIComponent(str));  //转码结果  amF2YXNjcmlwdCUyQyVFNSU4RCU5QSVFNSVBRSVBMg==
console.log(btoaStr);
console.log(window.decodeURIComponent(window.atob(btoaStr)));  //解码结果  javascript,博客