Question

我需要等待5秒才能运行第二行：

＆＃13;

function waitnext() {
    setTimeout('', 5000);
    alert('waited');
}

＆＃13;

然而，它似乎在运行该功能时立即打开警报。知道如何解决这个问题吗？感谢

Answer 1

function waitnext() {
   setTimeout( function(){
       alert('waited');
   }, 5000); 
}

waitnext();

你的语法错了。在这里，您可以使用文档 https://www.w3schools.com/jsref/met_win_settimeout.asp

Answer 2

作为setTimeout

的回调，在延迟一段时间之后放置您要运行的行

function waitnext() {
    setTimeout(function() {
        alert('waited'); // runs after 5000ms
    }, 5000);
}

Answer 3

setTimeout在经过指定的毫秒数后评估回调函数。

使用ES6的解决方案。

＆＃13;

let waitnext = () => {
  setTimeout(() => {
    // callback
    alert('waited');
  }, 5000);
}
waitnext();

＆＃13;

或使用ES5：

＆＃13;

'use strict';

var waitnext = function waitnext() {
  setTimeout(function () {
    // callback
    alert('waited');
  }, 5000);
};
waitnext();

＆＃13;

Answer 4

function waitnext(){
 setTimeout(function(){
 alert('waited');
}, 5000);

试试这个

Answer 5

一些样品......

 var myAlarm = e => console.log(e);
 var myStop = () => console.log('stop');
 var wait = (delay, callback) => setTimeout(callback, delay);

 wait(2000, () => myAlarm("finished after 2 seconds"));
 wait(3000, myStop);

 // the following line don´t work ...
 // the function was executed immediately
 wait(4000, myAlarm('cheesecake'));

//use setTimeout 
setTimeout(myStop, 1000);
// the following line don´t work ...
// the function was executed immediately
setTimeout(myAlarm('cheesecake'),3000);
// this works
setTimeout(() => myAlarm('cheesecake'),3000);

等待下一个功能不起作用

5 个答案: