3回答

• 

  嘉嘉h

  2017-02-23 09:43:03

  var mychar = document.getElementById("con").

  你的这里多加啦一个.

  0 0
• 

  慕粉1503351991

  2017-02-21 14:00:56

  var mychar=document.getElementById("con").style.display="none"

  
  

  你在none后面多加了个 .

  0 0
• 

  慕粉4044886

  2017-02-19 16:55:37

  document.getElementById("con").style="none";
  

  document.getElementById("con").style="block";

  0 0