问答详情
源自:8-5 计时器setTimeout()

正确答案是什么

请问这题的正确答案是什么。应不应该加个button

提问者:mengD 2016-11-13 15:02

个回答

  • 慕神5827342
    2017-01-18 20:20:26

    楼上,为什么startCount后面不用加()

  • 王延
    2016-11-21 10:13:05

      var num=0;
      function startCount() {
        document.getElementById('count').value=num;
        num=num+1;
        setTimeout("startCount()",1000);
      }
      window.onload=startCount;

  • 慕容5538410
    2016-11-13 16:32:05

     
      <script type="text/javascript">
       function count(){
        var oTxt1 = document.getElementById("txt1").value;
        var oTxt2 = document.getElementById("txt2").value;
        var oSlt = document.getElementById("select").value;
        var result = "";
        switch(oSlt) {
            case "+":
                result = parseFloat(oTxt1) + parseFloat(oTxt2);
                break;
            case "-":
                result = parseFloat(oTxt1) - parseFloat(oTxt2);
                break;
            case "*":
                result = parseFloat(oTxt1) * parseFloat(oTxt2);
                break;
            default:
                result = parseFloat(oTxt1) / parseFloat(oTxt2);
        }
        document.getElementById("fruit").value = result;
        
       }
      </script>