Editor: Solved the non-supporting problem of Chinese. First use escape () to encode Chinese. Then, then Base64 encoding. Decoding, add UNESCAPE () to decode Chinese.
base64 encoding / decoding </ title> </ head></p>
<p><script type = "text / javascript"> <! -</p>
<p>Var keyStr = "abcdefghijklmnop" "Qrstuvwxyzabcdef" "ghijklmnopqrstuv" "wxyz0123456789 /" "=";</p>
<p>Function Encode64 (INPUT) {INPUT = Escape (Input); var output = "; var chr1, chr2, chr3 ="; var ENC1, ENC2, ENC3, ENC4 = "; var i = 0;</p>
<p>Do {chr1 = input.charcodeat (i ); chr2 = input.charcodeat (i ); chr3 = input.charcodeat (i );</p>
<p>ENC1 = CHR1 >> 2; ENC2 = ((chr1 & 3) << 4) | (chr2 >> 4); ENC3 = ((chr2 & 15) << 2) | (chr3 >> 6); ENC4 = CHR3 & 63;</p>
<p>IF (ISNAN (CHR2)) {ENC3 = ENC4 = 64;} else if (isnan (chr3)) {eNC4 = 64;}</p>
<p>Output = OUTPUT Keystr.Charat (ENC1) Keystr.Charat (ENC2) Keystr.Charat (ENC3) Keystr.Charat (ENC4); Chr1 = chr2 = chr3 = ""; ENC1 = ENC2 = ENC3 = ENC4 = " "} Whi (i <input.length);</p>
<p>Return Output;</p>
<p>Function decode64 (INPUT) {var output = "; var chR1, chr2, chr3 ="; var ENC1, ENC2, ENC3, ENC4 = ""; var i = 0;</p>
<p>// Remove All Characters That Are Not AZ, AZ, 0-9, , /, OR = VAR Base64Test = / [^ A-ZA-Z0-9 / /// =] / g; if (Base64Test.exec (Input) {Alert ("Therele invalid base64 characters in the input text./n" "Valid Base64 Characters Are Az, AZ, 0-9, ' ', '/', and '=' / N" "EXPECT ERRORS in Decoding.");} Input = INPUT.REPLACE (/ [^ A-ZA-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 ));</p>
<p>CHR1 = (ENC1 << 2) | (ENC2 >> 4); Chr2 = ((ENC2 & 15) << 4) | (ENC3 >> 2); chr3 = ((ENC3 & 3) << 6) | ENC4 ;</p>
<p>Output = Output String.Fromcharcode (chr1);</p>
<p>IF (ENC3! = 64) {OUTPUT = OUTPUT STRING.Fromcharcode (chr2);} if (ENC4! = 64) {OUTPUT = Output String.Fromcharcode (chr3);}</p>
<p>CHR1 = CHR2 = CHR3 = ""; ENC1 = ENC2 = ENC3 = ENC4 = ""</p>
<p>} While (I <input.length);</p>
<p>Return Unescape (Output);</p>
<p>// -> </ script></p>
<p><body></p>
<p><form name = "base64form"></p>
<p>TYPE IN Base64, Or Paste <br> Base64 Encoded Text Into The Text Field, Select Encode or Decode, <br> And Click The Button! <br></p>
<p><textarea name = "THXTAREA Name =" 40 "rows =" 6 "> </ textarea> <br> <input type =" button "name =" encode "value =" eNCode to base64 "oncode to base64" onclick = "Document.base64form .theText.value = encode64 (document.base64Form.theText.value); "> <input type =" button "name =" decode "value =" decode from base64 "onClick =" document.base64Form.theText.value = decode64 ( Document.base64form.ThetExt.Value); ">>>>>></p>
<p></ form></p>
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