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This article mainly introduces the JavaScript implementation of a random number generator in detail to generate non-repeating random numbers. It has a certain reference value. Interested friends can refer to it. I hope it can help everyone.
1. Preparation before experiment:
Understanding of Math function
Understanding of array method
2. Experimental operation:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>随机数生成</title>
</head>
<style type="text/css">
body{font-size: 20px;}
#box{border:3px solid #666;width:500px;height:300px;margin:20px auto;padding:20px;position: relative;}
#min,#max{width: 60px;margin:5px;}
#num{margin:15px;width: 115px;}
button{width:80px;height:30px;letter-spacing: 10px;font-size: 15px;}
h1{margin: 10px 90px;}
</style>
<body>
<p>
<p id="box">
<h1>课堂提问生成器</h1>
<label>产生随机数的范围：</label><input type="text" id="min">--<input type="text" id="max"></br>
<label>需要产生多少个随机数：</label><input type="text" id="num"></br>
<button onclick="produce()">生成</button>
<p id="result"></p>
</p>
</p>
</body>
<script type="text/javascript">
function produce(){
var omin=document.getElementById("min").value;
var max=document.getElementById("max").value;
var num=document.getElementById("num").value;
var oArray=new Array;
var result="";
var min=omin;
for(var i=0;i<=max-omin;i++){
oArray[i]=min;
min++;
console.log(oArray[i]);
}
//没有去重的原代码
// for(var i=0;i<num;i++){
// result+=parseInt(Math.random()*(max-min+1) + min)+",";
// }
oArray.sort(function(){return 0.5 - Math.random(); }) //把按顺序存储的数组打乱
for(var i=0;i<num;i++){
result+=oArray[i]+",";
}
document.getElementById("result").innerText=result;
}
</script>
</html>3. Operation results
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