通常我们在做开发的时候需要通过单击切换对立事件，简单做了一个模型。
<!DOCTYPE html><html><head><title>javascript</title><meta charset="utf-8"><style type="text/css">#box{height: 200px;line-height: 200px;text-align: center;background: #eeeeee;}</style></head><body><div id="box">单击鼠标显示边框</div><script type="text/javascript">var box = document.getElementById('box');var flog = true;box.onclick = function(){if(flog){box.style.border = "3px solid #000000";box.innerHTML = "单击鼠标隐藏边框";flog = false;}else{box.style.border = "0px";box.innerHTML = "单击鼠标显示边框"flog = true;}}</script></body></html>
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