javascript – 代码给出错误,“ReferenceError：CryptoJS未定义”,而我已经包含了必需的.js引用,这是什么原因？

这是我的代码,我已经包含了以下.js文件,onpage load它给出了错误“ReferenceError：CryptoJS未定义”为什么它在添加了js引用时会给出错误.我正在使用Office 365创建一个sharepoint-2013应用程序.

<script type="text/javascript" src="../Scripts/sha1.js"></script>
<script type="text/javascript" src="../Scripts/hmac-sha1.js"></script>

  'use strict';

var context = SP.ClientContext.get_current();
var user = context.get_web().get_currentUser();

(function () {

    // This code runs when the DOM is ready and creates a context object which is 
    // needed to use the SharePoint object model
    $(document).ready(function () 
    {
        getUserName();

        $("#button1").click(function()
        {
                paraupdate();   
        });

    });

    // This function prepares,loads,and then executes a SharePoint query to get 
    // the current users information

    function paraupdate()
    {

        var str=""+$("#textBox1").val();
        alert(""+str);
        var message = str+"json539ff0f815ca697c681fe01d32ba52e3";
        var secret = "<my private key>";        
        var crypto = CryptoJS.HmacSHA1(message,secret).toString();
        alert("crypto answer is " + crypto);
        var siteurl="http://pnrbuddy.com/api/station_by_code/code/"+str+"/format/json/pbapikey/539ff0f815ca697c681fe01d32ba52e3/pbapisign/"+crypto;


         $.ajax({
            url: siteurl,type: "GET",dataType: 'json',success: function (data) {
                     alert("IN Success");
                alert(""+data.station_by_code);

            },error: function (error) {
                alert("IN Error");
                alert(JSON.stringify(error));
            }
        });       


    }


    function getUserName() 
    {
        context.load(user);
        context.executeQueryAsync(onGetUserNameSuccess,onGetUserNameFail);
    }

    // This function is executed if the above call is successful
    // It replaces the contents of the 'message' element with the user name
    function onGetUserNameSuccess() 
    {
        $("#label1").html("Enter Station Code : ");
        $("#button1").val("CLICK");

    }

    // This function is executed if the above call fails
    function onGetUserNameFail(sender,args) {
        alert('Failed to get user name. Error:' + args.get_message());
    }

})();