Type in the message you want to encode in base64, or paste base64 encoded text into the text field, select Encode or Decode, and click the button!
脚本说明: 把如下代码加入<body>区域中： <style> body{text-align:center;margin:5 0} table{border-collapse:collapse} body,td{font-size:12px;cursor:default} a:link,a:visited{color:#006600;text-decoration:none} a:hover{color:#9900FF;text-decoration:underline} </style></head> <body> <script type="text/javascript"> var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=" function encode64(input) { input = escape(input) var output = "" var chr1, chr2, chr3 = "" var enc1, enc2, enc3, enc4 = "" var i = 0 do { chr1 = input.charCodeAt(i++) chr2 = input.charCodeAt(i++) chr3 = input.charCodeAt(i++) enc1 = chr1 >> 2 enc2 = ((chr1 & 3) << 4) | (chr2 >> 4) enc3 = ((chr2 & 15) << 2) | (chr3 >> 6) enc4 = chr3 & 63 if (isNaN(chr2)) { enc3 = enc4 = 64 } else if (isNaN(chr3)) { enc4 = 64 } output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) + keyStr.charAt(enc3) + keyStr.charAt(enc4) chr1 = chr2 = chr3 = "" enc1 = enc2 = enc3 = enc4 = "" } while(i < input.length) return output } function decode64(input) { var output = "" var chr1, chr2, chr3 = "" var enc1, enc2, enc3, enc4 = "" var i = 0 // remove all characters that are not A-Z, a-z, 0-9, +, /, or = var base64test = /[^A-Za-z0-9\+\/\=]/g if (base64test.exec(input)) { alert("There were invalid base64 characters in the input text.\n" + "Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='\n" + "Expect errors in decoding.") } input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "") do { enc1 = keyStr.indexOf(input.charAt(i++)) enc2 = keyStr.indexOf(input.charAt(i++)) enc3 = keyStr.indexOf(input.charAt(i++)) enc4 = keyStr.indexOf(input.charAt(i++)) chr1 = (enc1 << 2) | (enc2 >> 4) chr2 = ((enc2 & 15) << 4) | (enc3 >> 2) chr3 = ((enc3 & 3) << 6) | enc4 output = output + String.fromCharCode(chr1) if (enc3 != 64) { output = output + String.fromCharCode(chr2) } if (enc4 != 64) { output = output + String.fromCharCode(chr3) } chr1 = chr2 = chr3 = "" enc1 = enc2 = enc3 = enc4 = "" } while (i < input.length) return unescape(output) } </script> <form name="base64Form"> Type in the message you want to encode in base64, or paste<br> base64 encoded text into the text field, select Encode or Decode, <br> and click the button!<br> <textarea name="theText" cols="80" rows="16"></textarea><br> <input type="button" name="encode" value="Encode to base64↓" onClick="document.base64Form.theText2.value=encode64(document.base64Form.theText.value);"> <input type="button" name="decode" value="Decode from base64↑" onClick="document.base64Form.theText.value=decode64(document.base64Form.theText2.value);"> <textarea name="theText2" cols="80" rows="16"></textarea><br><br> </form>