第一次提交

vippk-yy-template_v6_d/clientpkchatpub/script/extend/BASE64.js

@@ -0,0 +1,82 @@
+define(function(require, exports, module) {
+  
+  var code = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".split(""); //索引表
+  
+  /**
+   * @author laixiangran@163.com
+   * @description 将二进制序列转换为Base64编码
+   * @param {String}
+   * @return {String}
+   */
+  function binToBase64(bitString) {
+    var result = "";
+    var tail = bitString.length % 6;
+    var bitStringTemp1 = bitString.substr(0, bitString.length - tail);
+    var bitStringTemp2 = bitString.substr(bitString.length - tail, tail);
+    for (var i = 0; i < bitStringTemp1.length; i += 6) {
+      var index = parseInt(bitStringTemp1.substr(i, 6), 2);
+      result += code[index];
+    }
+    bitStringTemp2 += new Array(7 - tail).join("0");
+    if (tail) {
+      result += code[parseInt(bitStringTemp2, 2)];
+      result += new Array((6 - tail) / 2 + 1).join("=");
+    }
+    return result;
+  }
+  
+  /**
+   * @author laixiangran@163.com
+   * @description 将base64编码转换为二进制序列
+   * @param {String}
+   * @return {String}
+   */
+  function base64ToBin(str) {
+    var bitString = "";
+    var tail = 0;
+    for (var i = 0; i < str.length; i++) {
+      if (str[i] != "=") {
+        var decode = code.indexOf(str[i]).toString(2);
+        bitString += (new Array(7 - decode.length)).join("0") + decode;
+      } else {
+        tail++;
+      }
+    }
+    return bitString.substr(0, bitString.length - tail * 2);
+  }
+  
+  /**
+   * @author laixiangran@163.com
+   * @description 将字符转换为二进制序列
+   * @param {String} str
+   * @return {String}  
+   */
+  function stringToBin(str) {
+    var result = "";
+    for (var i = 0; i < str.length; i++) {
+      var charCode = str.charCodeAt(i).toString(2);
+      result += (new Array(9 - charCode.length).join("0") + charCode);
+    }
+    return result;
+  }
+ 
+  /**
+   * @author laixiangran@163.com
+   * @description 将二进制序列转换为字符串
+   * @param {String} Bin
+   */
+  function BinToStr(Bin) {
+    var result = "";
+    for (var i = 0; i < Bin.length; i += 8) {
+      result += String.fromCharCode(parseInt(Bin.substr(i, 8), 2));
+    }
+    return result;
+  }
+ 
+  exports.decodeBase64 = function(str) {
+    return BinToStr(base64ToBin(str));
+  }
+  exports.encodeBase64 = function(str) {
+    return binToBase64(stringToBin(str));
+  }
+})