added selectivr and shim to prepare old browser support

js/shims.js

+/*jslint indent: 2, maxlen: 80, nomen: true, sloppy: true, todo: true */
+/*global console, window, document */
+
+(function (window, document) {
+  "use strict";
+
+  // NOTE: old browsers need all of these
+  var shim_dict = {};
+
+
+  /* ====================================================================== */
+  /*                              SHIMS                                     */
+  /* ====================================================================== */
+  // NOTE: add more: https://github.com/kriskowal/es5-shim
+  // NOTE: to support IE8+/Windows Mobile where possible, test via modernizr
+
+
+  // =============================== indexOf ================================
+  if (!Array.prototype.indexOf) {
+    Array.prototype.indexOf = function(searchElement /*, fromIndex */) {
+      "use strict";
+
+      if (this === void 0 || this === null)
+        throw new TypeError();
+
+      var t = Object(this);
+      var len = t.length >>> 0;
+      if (len === 0)
+        return -1;
+
+      var n = 0;
+      if (arguments.length > 0)
+      {
+        n = Number(arguments[1]);
+        if (n !== n)
+          n = 0;
+        else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0))
+          n = (n > 0 || -1) * Math.floor(Math.abs(n));
+      }
+
+      if (n >= len)
+        return -1;
+
+      var k = n >= 0
+            ? n
+            : Math.max(len - Math.abs(n), 0);
+
+      for (; k < len; k++)
+      {
+        if (k in t && t[k] === searchElement)
+          return k;
+      }
+      return -1;
+    };
+  }
+
+  // =============================== BASE64 encoding ========================
+  // https://gist.github.com/yahiko/229984
+  shim_dict.Base64 = {
+    characters: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=" ,
+
+    /**
+     * Shim for atob (not available on IE8+9+Windows Mobile?)
+     * @method Base64.encode
+     * @param {string} string String to be hashed
+     * @return {string} encoded string
+     */
+    encode: function( string ) {
+      var characters = shim_dict.Base64.characters;
+      var result     = '';
+
+        var i = 0;
+        do {
+            var a = string.charCodeAt(i++);
+            var b = string.charCodeAt(i++);
+            var c = string.charCodeAt(i++);
+
+            a = a ? a : 0;
+            b = b ? b : 0;
+            c = c ? c : 0;
+
+            var b1 = ( a >> 2 ) & 0x3F;
+            var b2 = ( ( a & 0x3 ) << 4 ) | ( ( b >> 4 ) & 0xF );
+            var b3 = ( ( b & 0xF ) << 2 ) | ( ( c >> 6 ) & 0x3 );
+            var b4 = c & 0x3F;
+
+            if( ! b ) {
+                b3 = b4 = 64;
+            } else if( ! c ) {
+                b4 = 64;
+            }
+
+            result += characters.charAt( b1 ) + characters.charAt( b2 ) +
+                characters.charAt( b3 ) + characters.charAt( b4 );
+
+        } while ( i < string.length );
+
+        return result;
+    },
+
+    /**
+     * Shim for btoa (not available on IE8+9+Windows Mobile?)
+     * @method Base64.decode
+     * @param {string} string String to be hashed
+     * @return {string} encoded string
+     */
+    decode: function( string ) {
+      var characters = shim_dict.Base64.characters;
+      var result     = '';
+
+      var i = 0;
+      do {
+          var b1 = characters.indexOf( string.charAt(i++) );
+          var b2 = characters.indexOf( string.charAt(i++) );
+          var b3 = characters.indexOf( string.charAt(i++) );
+          var b4 = characters.indexOf( string.charAt(i++) );
+
+          var a = ( ( b1 & 0x3F ) << 2 ) | ( ( b2 >> 4 ) & 0x3 );
+          var b = ( ( b2 & 0xF  ) << 4 ) | ( ( b3 >> 2 ) & 0xF );
+          var c = ( ( b3 & 0x3  ) << 6 ) | ( b4 & 0x3F );
+
+          result += String.fromCharCode(a) + (b?String.fromCharCode(b):'') + (c?String.fromCharCode(c):'');
+
+      } while( i < string.length );
+
+      return result;
+    }
+  };
+
+  window.shim = shim_dict;
+
+}(window, document));
\ No newline at end of file