Question

这是JS代码这里函数stopi不起作用。什么问题？ / * 理想情况下，您可以在代码块之外添加尽可能多的说明和上下文，因为您不再局限于混合代码和有关代码的元信息。

通过粗略检查您的屏幕截图，评论似乎由TA或讲师插入，作为您正在完成的课程的一部分，并且可能与您的问题无关。删除它们，并在代码块之外汇总必要的详细信息。 * /

function fun(){ 

    var stopping = setInterval(_fun,1500); // interval
}

function _fun(){ 

    var i = Math.floor((Math.random()*9)+1);
    //var doc = document.getElementById(""+i+"");
    document.getElementById("pp").innerHTML = i ;

    switch(i)
  {
        case 1:
    {
        if(document.getElementById("1").bgColor == "orange")
        {
            document.getElementById("1").bgColor = "red";

            break;
        }
        else if(document.getElementById("1").bgColor == "yellow"){
            document.getElementById("1").bgColor = "orange";
            break;
        }
        else
        document.getElementById("1").bgColor = "yellow";
    break;
    }
    case 2:
    {
        if(document.getElementById("2").bgColor == "yellow"){
            document.getElementById("2").bgColor = "orange";
            break;
        }
        else
        document.getElementById("2").bgColor = "yellow";
    break;
    }
    case 3:
    {
        if(document.getElementById("3").bgColor == "yellow"){
            document.getElementById("3").bgColor = "orange";
            break;
        }
        else
        document.getElementById("3").bgColor = "yellow";
    break;
    }
    case 4:
    {
        if(document.getElementById("4").bgColor == "yellow"){
            document.getElementById("4").bgColor = "orange";
            break;
        }
        else
        document.getElementById("4").bgColor = "yellow";
    break;
    }
    case 5:
    {
        if(document.getElementById("5").bgColor == "yellow"){
            document.getElementById("5").bgColor = "orange";
            break;
        }
        else
        document.getElementById("5").bgColor = "yellow";
    break;
    }
    case 6:
    {
        if(document.getElementById("6").bgColor == "yellow"){
            document.getElementById("6").bgColor = "orange";
            break;
        }
        else
        document.getElementById("6").bgColor = "yellow";
    break;
    }
    case 7:
    {
        if(document.getElementById("7").bgColor == "yellow"){
            document.getElementById("7").bgColor = "orange";
            break;
        }
        else
        document.getElementById("7").bgColor = "yellow";
    break;
    }
    case 8:
    {
        if(document.getElementById("8").bgColor == "yellow"){
            document.getElementById("8").bgColor = "orange";
            break;
        }
        else
        document.getElementById("8").bgColor = "yellow";
    break;
    }
    case 9:
    {
        if(document.getElementById("9").bgColor == "yellow"){
            document.getElementById("9").bgColor = "orange";
            break;
        }
        else
        document.getElementById("9").bgColor = "yellow";
    break;
    }
  }
}
function stopi(){
    clearInterval(stopping);
}

这是html代码

<html>
<body>
<script src="New.js">
</script>
<p id="pp"></p>
<button onclick="fun()"> Start </button>
<button onclick="stopi()"> Cancel </button>
<br>
<br>
<table border="1" style="width:15%">
  <tr>
    <td id="1">1</td>
    <td id="2">2</td>       
    <td id="3">3</td>
  </tr>
  <tr>
    <td id="4">4</td>
    <td id="5">5</td>       
    <td id="6">6</td>
  </tr>
  <tr>
    <td id="7">7</td>
    <td id="8">8</td>       
    <td id="9">9</td>
  </tr>
</table>
</body>
</html>

Answer 1

function fun(){ 

    var stopping = setInterval(_fun,1500); // interval
}

停止是fun()函数的局部变量。将其声明为全局，以便您可以从其他函数访问它

    var stopping;

    function fun(){  
        stopping = setInterval(_fun,1500); // interval
    }
    function stopi(){
        clearInterval(stopping);
    }

Answer 2

您必须在函数外声明stopping变量：

var stopping;

function fun(){ 
    stopping = setInterval(_fun,1500); // interval
}

javascript函数stopi不起作用

2 个答案: