javascript从网络下载随机笑话

    /***
     * 讲笑话函数(调试用)
     * @param callback 回调函数
     */
    function randomText(callback) {
        var result ='';
        $.ajax({
            type:"get",
            url:"http://www.mxnzp.com/api/jokes/list/random",
            dataType:"json",
            async:false,
            success:function(response){
                var code = response.code;
                var data = response.data;
                if(code == 1 && data.length > 1) {
                    var text = data[0].content;
                    callback(text);
                    result = text;
                }
            },error:function (res) {
                console.log("调用笑话接口失败",res);
            }
        })
        return result;
    }

调用方法
    /***
     * 注册事件处理委托
     */
    $("#convert").click(function(){
        textToSpeech(randomText(
            function(text){
                //调试过程中往文本上添加笑话内容
                $("textarea#text").text(text);
            }
        ),function (state,response) {
            switch (state) {
                case 'fail':
                    console.error("调用失败,",response);
                    break;
                case 'success':
                    onSuccess(response);
                    break;
            }
        });
    });