使用mui中的搜索，监听keypress事件里，请求ajax总是失败，请大神指点

如果不在监听搜索的keypress里面请求ajax的话，就会成功，想请教大佬.

        <form class="mui-input-row mui-search">  
            <input id="searchInput" type="search" class="mui-input-clear" placeholder="">  
        </form>

<script type="text/javascript">  
            mui.init();  
            var text = document.querySelector('#searchInput');  
            text.addEventListener('keypress', function() {  
                var name = text.value;  
                if(name == '') {  
                    plus.nativeUI.toast('搜索关键字不能为空！')  
                } else {  
                    loadList(name);  
                }  
            });  
            /*请求列表数据*/  
            function loadList(name) {  
                var urlStr = encodeURI(name);  
                url = 'http://127.0.0.1:1500/Service/?name=' + urlStr;  
                mui.ajax(url, {  
                    dataType: 'json',  
                    type: 'get',  
                    timeout: 10000,  
                    success: function(data) {  
                        console.log('success');  
                        data = JSON.parse(data);  
                    },  
                    error: function() {  
                        console.log("获取失败");  
                    }  
                });  
            }  
        </script>