一、
function task1(){
console.log('第⼀个任务')
}
function task2(){
console.log('第⼆个任务')
}
function task3(){
console.log('第三个任务')
}
function task4(){
console.log('第四个任务')
}
task1()
setTimeout(task2,1000)
setTimeout(task3,500)
task4()二、
function task1(){
console.log('task1执⾏')
task2()
console.log('task2执⾏完毕')
}
function task2(){
console.log('task2执⾏')
task3()
console.log('task3执⾏完毕')
}
function task3(){
console.log('task3执⾏')
}
task1()
console.log('task1执⾏完毕')
