javascript在线随机生成可预览的随机背景颜色

使用方法

// Some Variables 
var genButton = document.getElementById("gen"), // Generate button
    clear  = document.getElementById("clear"),  // Clear button
    output = document.getElementById("randomNum"),  // Output space
    copy = document.getElementById("copy"),  // Copy to Clipboard Button
    copyCheck = document.getElementById("copyCheck");  // copy check
  

// Get Random Number Function && make it the background of the body xD
function getRandomNum() {
    "use strict";
    output.value = "#" + Math.floor((1e+5) + Math.random() * (9e+5)); // get random 6-digits number
  var bgClr = output.value; 
  document.getElementById("preview").style.backgroundColor = bgClr;  // set body bgColor to that random number
}
// Clear Random Number Function + make background of the body as default 
function clearNum() {
    "use strict";
    output.value = "";   // clear output space
   document.getElementById("preview").style.backgroundColor = "#F1A9A0";   // make bgColor of the body as default
}
// Copy the color code to the clipboard by clicking on "Copy" Button
function copyToClipBoard() {
  "use strict";
  document.execCommand("copy", false, output.select());
  copyCheck.style.right = "20px";
  showCheck = setTimeout(function() {
    copyCheck.style.right = "-200px";
  }, 3000);
  clearTimeout(showCheck);
}
// Adding EventListener to the buttons
genButton.addEventListener("click", getRandomNum);  // Generate Button
clear.addEventListener("click", clearNum);   // Clear Button
copy.addEventListener("click", copyToClipBoard);

//---------------- Thanks for being here --------------------- //