indexof polyfill

+/**
+ * Array indexof polyfill
+ * @author: xuqi<qi.xu@yoho.cn>
+ * @date: 2016/8/8
+ * @source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf
+ */
+
+if (!Array.prototype.indexOf) {
+    Array.prototype.indexOf = function(searchElement, fromIndex) { // eslint-disable-line
+        var k;
+        var o;
+        var len;
+        var n;
+
+        if (this == null) {  // eslint-disable-line
+            throw new TypeError('"this" is null or not defined');
+        }
+
+        o = Object(this);
+
+        len = o.length >>> 0;
+
+        if (len === 0) {
+            return -1;
+        }
+
+        n = +fromIndex || 0;
+
+        if (Math.abs(n) === Infinity) {
+            n = 0;
+        }
+
+        if (n >= len) {
+            return -1;
+        }
+
+        k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
+
+        while (k < len) {
+            if (k in o && o[k] === searchElement) {
+                return k;
+            }
+            k++;
+        }
+        return -1;
+    };
+}

@@ -25,6 +25,7 @@ var editTpl = require('../../../tpl/shopping/edit-color-size.hbs');
 var Cart;
 
 require('yoho-jquery-dotdotdot');
+require('../../common/indexof-polyfill'); // array indexof polyfill
 
 function dotName() {