js实现输入框自动提示功能

$("#titleInput").keyup(function(){
$("#titleInput").autocomplete({
source:	GetReturnValue()
});
});

function GetReturnValue() {
var result = "";
$.ajax({
type: "POST",
url: "url",
data: "keyword="+$("#titleInput").val(),
dataType: "json",
async: false,//同步
success: function (data) {
result = eval( data.title);
}, error: function () {
result = "err";
alert("err result:"+result);
}
})
return result;
}