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class Tom{
constructor(){
this.queue = []
setTimeout(()=>{
this.next();
},0)
}
next(){
let fun = this.queue.shift();
fun && fun();
}
eat(value){
let fun = ()=>{
console.log(value);
this.next();
}
this.queue.push(fun);
return this
}
sleepFirst(gap){
let fun = ()=>{
setTimeout(()=>{
this.next();
},gap)
}
this.queue.unshift(fun);
return this
}
sleep(gap){
let fun = ()=>{
setTimeout(()=>{
this.next();
},gap)
}
this.queue.push(fun);
return this
}
play(value){
let fun = ()=>{
console.log(value);
this.next();
}
this.queue.push(fun)
return this
}
}
new Tom().eat('apple').sleep(2000).play('soccer').sleepFirst(1000);
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