<!DOCTYPE html> <html> <body> <h1>Window 对象</h1> <h2>btoa() 方法</h2> <p>btoa() 方法以 base-64 编码字符串。</p> <p>IE9 及更早版本不支持 btoa() 方法。</p> <p id="demo"></p> <script> let text = "Hello World!"; let encoded = window.btoa(text); document.getElementById("demo").innerHTML = "原始字符串:" + text + "<br>已编码字符串:" + encoded; </script> </body> </html>