## **如何实现一个事件绑定（监听）** ``` <ul> <li>1</li> <li>2</li> <li>3</li> <li>4</li> </ul> <script> var lis = document.getElementsByTagName('li'); for(let i = 0;i<lis.length;i++){ lis[i].onclick=function(){ console.log(this.innerHTML) } } </script> ``` jquery： ``` <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script> <ul> <li>1</li> <li>2</li> <li>3</li> <li>4</li> </ul> <script> $('li').click(function(){ console.log($(this).text()) }) </script> ```