setTimeout执行完之后调用回调函数实例

    demo: function(callback, delay=2000){
            this.status = false;
            setTimeout(function(){
                this.status = true;
            }, delay);
            let timer = setInterval(function(){
                if(this.status){
                    clearInterval(timer);
                    delete this.status;
                    if (typeof callback == 'function') {
                        callback();
                    }
                }
            },500);
        },

demo: function(callback, delay=2000){

this.status = false;

setTimeout(function(){

this.status = true;

}, delay);

let timer = setInterval(function(){

if(this.status){

clearInterval(timer);

delete this.status;

if (typeof callback == 'function') {

callback();

}

},500);

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