个回答

• 刘毅毅

  2016-09-27 02:41:03

  已采纳

          function count(){
              var t1=document.getElementById("txt1")这里缺.value;
              var t2=document.getElementById("txt2")这里缺.value;
              var s1=document.getElementById("select")这里缺.value;

  
  

  1