JavaScript promise使用

function getMessageData() {
		var queryUrl = "http://1.1.1.1:1";
		var param = {};
		return new Promise((resolve, reject)=>{
				request.post(queryUrl, JSON.stringify(param), function(result){
					if(result.Result == 0 && result.Data.length > 0){
						resolve(result.Data)
					} else{
						resolve('');
						console.log('error', result);
					}
				}, function(error){
					console.log(error);
					reject('error', error);
				})
			}).catch((err)=>{
				console.log('error', err);
			})
		}

function getMessageData() {
			var queryUrl = "http://1.1.1.1:1";
			var param = {};
			return new Promise((resolve, reject) => {
				request.post(queryUrl, JSON.stringify(param ), function (result) {
					if (result.Result == 0 && result.Data.length > 0) {
						resolve(result.Data)
					} else {
						resolve('')
					}
				}, function (error) {
					console.log(error)
					reject(error)
				})
			}).then(data => {
				var param = data;
				return new Promise((resolve, reject) => {
					request.post(queryUrl, JSON.stringify(param), function (result) {
						if (result.Result == 0) {
							resolve(result)
						} else {
							console.log(result)
							resolve('')
						}
					}, function (error) {
						console.log(error)
						reject(error)
					})
				})
			}).catch((err) => {
				console.log(err)
			})
		}

async function loadData() {
	var messageList = await getMessageData();
	console.log(messageList );
}

function loadData(){
	getMessageData().then(data => {
			console.log(data);				
	});
}