Javascript中绑定click事件的四种方式介绍

<button id="vv"  ="myfunction()" >哈哈</button>

var funcc = function () {
  alert('我爱编程')
  }
var aa = document.getElementById('vv')
aa.  = funcc

document.getElementById('vv').  = function () {
  alert('hasssshhaa ')
  } 

document.getElementById('vv').addEventListener('click',funcc);
//或者：
document.getElementById('vv').addEventListener('click',function () {
  alert('hahah')
  })