Question

寻找那些比我更了解情况的人的指导。

我正在编写一个程序，提示用户点击一个按钮，然后生成一个从1到100的随机整数。

我可以很好地管理那部分。我正在努力的是让程序打印出这个随机整数的范围，即i <= 33。

例如，当我点击我想看的按钮时：

＆＃34; 10是一个小于33＆＃34;

的数字

或

＆＃34; 55是33到66之间的数字＆＃34;

到目前为止，这是我的代码，我已将我遇到问题的代码放在评论中。

<!DOCTYPE HTML5>

<html>
<head>
    <meta charset="UTF-8">
    <title>question2</title>
</head>

<body>

    <p>Click the button to display a random number from 1 to 100.</p>

    <button onclick="myFunction()">Click here</button>

    <p id="demo"></p>

    <script>
    function myFunction() {
        var text = "";
        var i = Math.floor((Math.random() * 100) + 1);
        document.getElementById("demo").innerHTML = i;

        }

//          if (myFunction <= 33) {
//          text += ("<br>" + i + " is a number less than or equal to 33");
//          } 

//          if (myFunction > 34 and i < 65) {
//          text += ("<br>" + i + " is a number between 33 and 66 (exclusive)");
//          } 

//          if (my Function >= 66) {
//          text += ("<br>" + i + " is a number greater than or equal to 66");
//          } 



    </script>

</body>
</html>

谢谢你们。

Answer 1

您可以测试，true是否显示结果并退出。

＆＃13;

function getRandom() {
    var i = Math.floor((Math.random() * 100) + 1);

    if (i <= 33) {
        document.getElementById("demo").innerHTML += i + " is a number less than or equal to 33<br>";
        return;
    }
    if (i < 66) {
        document.getElementById("demo").innerHTML += i + " is a number between 33 and 66 (exclusive)<br>";
        return;
    }
    document.getElementById("demo").innerHTML += i + " is a number greater than or equal to 66<br>";
}

＆＃13;

<p>Click the button to display a random number from 1 to 100.</p>
<button onclick="getRandom()">Click here</button>
<p id="demo"></p>

＆＃13;

Answer 2

你的意思是这样的：

    function myFunction() {
        var text = "";
        var i = Math.floor((Math.random() * 100) + 1);

        if (i <= 33) {
            text += ("<br>" + i + " is a number less than or equal to 33");
        } 

        if (i > 34 && i < 65) {
            text += ("<br>" + i + " is a number between 33 and 66 (exclusive)");
        } 

        if (i >= 66) {
            text += ("<br>" + i + " is a number greater than or equal to 66");
        } 

        document.getElementById("demo").innerHTML = text;
    }

Answer 3

问题是你在该函数之外的myFunction()内部调用变量。示例包括i和myFunction()。最好将if else语句放在main函数中。

function myFunction() {
    var demo = document.getElementById("demo");
    var i = Math.floor((Math.random() * 100) + 1);
    if (i <= 33) {
        demo.innerHTML = i + " is a number less than 33";
    }
    else if (i < 65) {
        demo.innerHTML = i + "is a number between 33 and 65";
    }
    else {
        demo.innerHTML = i + " is a number greater than or equal to 66";  
    }
}

<p>Click the button to display a random number from 1 to 100.</p>

    <button onclick="myFunction()">Click here</button>

    <p id="demo"></p>

Answer 4

您的功能不是您在if语句中应该比较的功能。

但是，我确实扔了一些东西让我知道这是不是你想要的。

你走在正确的轨道上。同样在中间比较中，我将“和”更改为短路“＆amp;＆amp;”。

JSfiddle：https://jsfiddle.net/xew8dvbd/

$(document).ready(function() {
 function myFunction() {
  var i = Math.floor((Math.random() * 100) + 1);
  var text = "";
  if (i <= 33) {
   text += ("<br>" + i + " is a number less than or equal to 33");
  }
  if (i > 34 && i < 65) {
   text += ("<br>" + i + " is a number between 33 and 66 (exclusive)");
  }
  if (i >= 66) {
   text += ("<br>" + i + " is a number greater than or equal to 66");
  }
  document.getElementById("demo").innerHTML = text;
};
$("#submit").click(myFunction);
});

Answer 5

不确定原因，但我必须将其作为函数表达式而不是函数定义才能使其工作。奇怪的是，这是第二次在最后一小时内作为陷阱工作。

＆＃13;

public class Form1 : Form
{
    private readonly ListArticle _articles = new ListArticle();

    // assume strings have been added to articles by this point.

    // option 1 - use same ListArticle instance
    public void Foo()
    {
        var form = new Form2();
        form.Articles = _articles; 
    }

    // option 2 - add strings to new ListArticle
    public void Bar()
    {
        var articles = new ListArticle();
        articles.Clothes.AddRange(_articles.Clothes);
        var form = new Form2();
        form.Articles = articles;
    }
}

public class Form2 : Form
{
    public ListArticle Articles { get; set; }
}

＆＃13;

myFunction = function() {
   var text = "";
   var i = Math.floor((Math.random() * 100) + 1);
   document.getElementById("demo").innerHTML = i;
   switch (true) {
     case (i < 20):
       console.log(i + " is less than 20.");
       break;
     case (i < 40):
       console.log(i + " is between 21 and 40.");
       break;
     case (i < 60):
       console.log(i+ " is between 21 and 60.");
       break;
     default:
       console.log(i+ " is over 60.");
   }
   };

＆＃13;

随机数生成器Javascript - 范围

5 个答案: