Returns true if the value is present in the list, using === to test equality. UsesindexOf internally, if list is an Array.

检测值是否在列表中出现过，如果出现返回true

1 _.include([1, 2, 3], 3);2 => true

源码:

1  _.include = _.contains = function(obj, target) {2     var found = false;3     if (obj == null) return found;4     if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1;5     found = any(obj, function(value) {6       return value === target;7     });8     return found;9   };