Question

所以我的主要目标是在单击按钮后每1秒随机化背景一次。问题是我在控制台输出时每秒获得随机RGB，但是背景仅在上次迭代后才更改。

function random_background(){
var i;
for(i = 0; i < 3; i++){
    let red = Math.floor(Math.random() * 256);
    let green = Math.floor(Math.random() * 256);
    let blue = Math.floor(Math.random() * 256);
    let randomcolor = "rgb(" + red + "," + green + "," + blue + ")";
    console.log(randomcolor);
    document.body.style.background = randomcolor;
    sleep(1000);
}
}

Answer 1

Javascript没有任何睡眠方法。要在x次后重复调用函数，可以使用function random_background() { let red = Math.floor(Math.random() * 256); let green = Math.floor(Math.random() * 256); let blue = Math.floor(Math.random() * 256); let randomcolor = "rgb(" + red + "," + green + "," + blue + ")"; document.body.style.background = randomcolor; } setInterval(random_background, 1000);

public class Main {


    public static void main(String[] args) {
        int count;
        boolean[] used;

        used = new boolean[365];

        count = 0;

        while (true) {
            int birthday;  // The selected birthday.
            birthday = (int) (Math.random() * 365);
            count++;
            if (used[birthday]) {
                // This day was found before; It's a duplicate.
                break; }

            used[birthday] = true; }
        System.out.println("A duplicate birthday was found after "
                + count + " kids came to the class.");


      //  double[] arr = {Numbers};
       // double total = 0;

        //for(int i=0; i<arr.length; i++){
           // total = total + arr[i];
        //}



        //double average = total / arr.length;


       // System.out.format("The average is: %", average);

    }

Answer 2

使用setinterval代替sleep使浏览器有机会做其他事情。例如，更新显示

Answer 3

Javascript中没有sleep函数。您应该使用setInterval来运行函数，直到清除间隔且间隔为1秒为止。

此外，我不明白为什么在这里需要for循环，所以我将其删除。

let interval = setInterval(() => {
  let red = Math.floor(Math.random() * 256);
  let green = Math.floor(Math.random() * 256);
  let blue = Math.floor(Math.random() * 256);
  let randomcolor = "rgb(" + red + "," + green + "," + blue + ")";
  document.body.style.background = randomcolor;
}, 1000);

背景色不适用于for循环

3 个答案: