带有js特效的网站

<script src="script.js" async></script>

if (typeof Object.assign !== 'function') {
  Object.assign = function(target) {
    'use strict';
    if (target == null) {
      throw new TypeError('Cannot convert undefined or null to object');
    }
    target = Object(target);
    for (var index = 1; index < arguments.length; index++) {
      var source = arguments[index];
      if (source != null) {
        for (var key in source) {
          if (Object.hasOwnProperty.call(source, key)) {
            target[key] = source[key];
          }
        }
      }
    }
    return target;
  };
}

function setupEventListener() {
  var button = document.getElementById('myButton');
  function handleClick() {
    console.log('Button clicked!');
  }
  button.addEventListener('click', handleClick);

  // 在不需要时移除事件监听器
  function cleanup() {
    button.removeEventListener('click', handleClick);
  }
}