用回调函数解决页面数据回显问题

var taskUtils = {
getTaskNameById:function (taId,callback) {//回显任务名称
var url = "gccjTaskSendCountyController.do?taskAssignment&id="+taId;
$.getJSON(url, function(json){
var taskName = json.obj.taskName;
callback(taskName);
});
}
}

taskUtils.getTaskNameById('${gccjTaskSendCountyPage.taId}',function(taskName){
$('#taId_name').val(taskName);
});