此JavaScript代码中的setInterval如何工作？

Posted 2023-01-31

我试图在学校项目的javascript中尝试使用setInterval函数，但我不知道如何解释它的工作原理。此JavaScript代码如何工作？它旨在随机更改颜色。

setInterval(function()
var x = Math.round(Math.random() * 255);
var y = Math.round(Math.random() * 255);
var z = Math.round(Math.random() * 255);
var bg = "background:rgb("+x+" , "+y+" , "+z+");";
var element = document.getElementById("color");
element.style = bg;
, 1000);

答案

请参阅此代码中的注释：

setInterval(function()
// generates red color band number as a random number
var x = Math.round(Math.random() * 255);
// generates blue color band number as a random number
var y = Math.round(Math.random() * 255);
// generates green color band number as a random number
var z = Math.round(Math.random() * 255);
// concatines a string which will be used to replace the style of the element
// with the newly generated RGB values
var bg = "background:rgb("+x+" , "+y+" , "+z+");";
// gets the elements that will have its style changed
var element = document.getElementById("color");
// changes the style to the newly generated style
element.style = bg;
// this will occur with an interval of 1000
, 1000);