字符串拼接 多請求數據合併 確保都請求成功才執行

var name = '小明';
var age = 20;
var message = '你好, ' + name + ', 你今年' + age + '歲了!';
alert(message);



es6寫法
var name = '小明';
var age = 20;
var message = `你好, ${name}, 你今年${age}歲了!`;
alert(message);

要判斷一個屬性是否是xiaoming自身擁有的，而不是繼承得到的，可以用hasOwnProperty()方法

var xiaoming = {
    name: '小明'
};
xiaoming.hasOwnProperty('name'); // true
xiaoming.hasOwnProperty('toString'); // false

 

多請求數據合併 確保都請求成功才執行

 

var data1 = null;
    var data2 = null;
    
    function drawView() {
        if (data1 && data2) {
            // do someting.....
        }
    }

    setTimeout(() => {
        data1 = 1;
        this.drawView();
    }, 1000);

    setTimeout(() => {
        data2 = 2;
        this.drawView();
    }, 1500);
    
    定時器是兩個請求
    
    
    promise.all方法    async  await方法
    
    
    
    
    
     async getFaceResult () {
        try {
            let location = await this.getLocation(this.phoneNum);
            if (location.data.success) {
                let province = location.data.obj.province;
                let city = location.data.obj.city;
                let result = await this.getFaceList(province, city);
                if (result.data.success) {
                    this.faceList = result.data.obj;
                }
            }
        } catch(err) {
            console.log(err);
        }
    }