function click(){
this.index = this.index == 0 ? 1 : this.index + 1;
this.tt && clearTimeout(this.tt);
if (this.index == 1) {
this.start_time = new Date().getTime();
this.tt = setTimeout(()=>{
console.log('单击');
this.index = this.start_time = this.end_time = 0;
this.tt && clearTimeout(this.tt);
},200)
} else if (this.index == 2) {
this.end_time = new Date().getTime();
if (this.end_time - this.start_time < 300) {
console.log('双击了屏幕');
}
this.index = this.start_time = this.end_time = 0;
}
}