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JavaScript randomly selects 10 non-repeating numbers between 0-100_javascript skills

PHP中文网Original: 2016-05-16 15:13:362669browse

Currently, I have only learned two simple methods to help you randomly select 10 non-repeating numbers between 0-100. The details are as follows

The first method Use the feature that the array length can be rewritten

Idea: You can use a for loop to loop out the numbers from 0 to 100 and put them in an array, and then use sort( ) randomly scrambled, and then by rewriting the length of this array to 10, 10 different numbers were obtained.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <script>
  var arr=[];
  for(var i=0;i<100;i++){//一个从0到100的数组
    arr.push(i);
  }
  arr.sort(function(){//随机打乱这个数组
    return Math.random()-0.5;
  })
  arr.length=10;//改写长度
  console.log(arr);//控制台会输出10个不同的数
  </script>
</head>
<body>
</body>
</html>

The second one takes advantage of the unique key value of the json object.

Idea: first define an empty array to save the array and an empty json object,

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <script>
  //json对象,key值是唯一的,key值可以为数字
  var arr=[];
  var json={};
  while(arr.length<10){
    var k=Math.round(Math.random()*100);
    if(!json[k]){
      json[k]=true;
      arr.push(k);
    }
  }
  console.log(arr)
  </script>
</head>
<body>
    
</body>
</html>

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