javascript - 在执行下一行之前等待5秒(Wait 5 seconds before executing next line)

Question

This function below doesn't work like I want it to;

(下面的这个功能不像我想要的那样工作;)

being a JS novice I can't figure out why.

(作为一个JS新手我无法弄清楚为什么。)

I need it to wait 5 seconds before checking whether the newState is -1 .

(我需要等待5秒才能检查newState是否为-1 。)

Currently, it doesn't wait, it just checks straight away.

(目前，它不会等待，它只是立即检查。)

function stateChange(newState) {
  setTimeout('', 5000);

  if(newState == -1) {
    alert('VIDEO HAS STOPPED');
  }
}

  ask by copyflake translate from so

Answer 1

You have to put your code in the callback function you supply to setTimeout :

(您必须将代码放在您提供给setTimeout的回调函数中：)

function stateChange(newState) {
    setTimeout(function () {
        if (newState == -1) {
            alert('VIDEO HAS STOPPED');
        }
    }, 5000);
}

Any other code will execute immediately.

(任何其他代码将立即执行。)