小编Nin*_*sen的帖子

我正在尝试让事件侦听器为在循环内创建的类工作。我无法让它工作，有什么建议吗？

window.onload = function(){
  var div = document.createElement('div'),
    container = document.getElementById('container'),
    classname = document.getElementsByClassName("hello");

  div.className = 'hello';

  var tasks = [
    'One',
    'Two',
    'Three',
    'Four'
  ];

  for (var i = 0; i < tasks.length; ++i) {
    container.innerHTML += '<div class="hello"><p>' + tasks[i] + '</p></div>';
  }

  classname.addEventListener('click', function(){
    this.className = 'done';
  });

  console.log(classname);
};