前端第十三课：javascript基础2-PHP培训九期线上班

对象

定义对象

var obj = new Object();
obj.name="bo";
obj.age = "18";
obj.abb = function(){
            console.log('我说话');
};
obj.abb();

var obj = {name: "bo", age: "18"};
obj.addr = "shen zhen";
obj.speak = function(str){
console.log('我会说话了【'+str+'】');
        }
obj.speak('hello js object');

var obj = {
      name:"bo",
        age:18,
        speek:function(str,str2){
                console.log('我说话了: '+str);
                console.log('str2='+str2);
            },
        speek2:function(){
            this.speek('speek2 调用了speek','aa');
            }
        }
        obj.speek2();

定时器

setTimeout()

只执行一次延时

 setTimeout(function () {
        console.log('页面加载');
}, 3000);

setInterval()

一直执行，使用 clearInterval() 结束

var haak = setInterval(function(){
  console.log('this is setInterval()');
  clearInterval(haak);
},1000);

倒计时

function send(){
            var flag=10;
            var txt = document.getElementById('btn').textContent;
            var timer = setInterval(function(){
                document.getElementById('btn').textContent = flag+'秒后重试';
                flag--;
                if(flag==0){
                    document.getElementById('btn').textContent = txt;
                    clearInterval(timer);
                }
            },1000);
        }