colori random con pulsante

pulsante per cambio colori
当前为 2022-06-27 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name           colori random con pulsante
// @author         figuccio
// @namespace      https://gf.qytechs.cn/users/237458
// @description    pulsante per cambio colori
// @version        0.2
// @match          *://*/*
// @grant          GM_registerMenuCommand
// @noframes
// @grant         GM_addStyle
// @grant         GM_setValue
// @grant         GM_getValue
// @license        MIT
// ==/UserScript==
(function() {
    'use strict';
    var Button = document.createElement('button');
    document.getElementsByTagName('body')[0].appendChild(Button);
    Button.setAttribute ('id', 'prova');
    Button.setAttribute ('title', 'cambio colore');
    Button.style = "position:absolute; top:370px;right:;z-index:9999999999999999999999;background-color:blue;color:red;";
    Button.innerHTML = "cambia colore";
    Button .addEventListener("click",getRandomColor);

    function getRandomColor() {
 var letters = "0123456789ABCDEF";
  var randomColor = "#";
  for (var i = 0; i < 6; i++) {
    randomColor += letters[Math.floor(Math.random() * letters.length)];
  }
  document.body.style.backgroundColor = randomColor;
}
})();

////////////////////
// Make the DIV element draggable:
dragElement(document.getElementById("prova"));

function dragElement(elmnt) {
  var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
  if (document.getElementById(elmnt.id + "header")) {
    // if present, the header is where you move the DIV from:
    document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
  } else {
    // otherwise, move the DIV from anywhere inside the DIV:
    elmnt.onmousedown = dragMouseDown;
  }

  function dragMouseDown(e) {
    e = e || window.event;
    e.preventDefault();
    // get the mouse cursor position at startup:
    pos3 = e.clientX;
    pos4 = e.clientY;
    document.onmouseup = closeDragElement;
    // call a function whenever the cursor moves:
    document.onmousemove = elementDrag;
  }

  function elementDrag(e) {
    e = e || window.event;
    e.preventDefault();
    // calculate the new cursor position:
    pos1 = pos3 - e.clientX;
    pos2 = pos4 - e.clientY;
    pos3 = e.clientX;
    pos4 = e.clientY;
    // set the element's new position:
    elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
    elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
  }

  function closeDragElement() {
    // stop moving when mouse button is released:
    document.onmouseup = null;
    document.onmousemove = null;
  }
}
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