Failed to execute ‘btoa‘ on ‘Window‘: The string to be encoded contains characters outside of the La

var str = "äöüÄÖÜçéèñ";
var b64 = window.btoa(unescape(encodeURIComponent(str)))
console.log(b64);var str2 = decodeURIComponent(escape(window.atob(b64)));
console.log(str2);

参考链接： https://stackoverflow.com/questions/23223718/failed-to-execute-btoa-on-window-the-string-to-be-encoded-contains-characte

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Failed to execute ‘btoa‘ on ‘Window‘: The string to be encoded contains characters outside of the La

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