How to randomly select 4 numbers without repeating numbers in js

This article mainly shares with you the method of randomly selecting 4 non-repeating numbers in js, ranging from 0 to 9. I hope it can help you.

html

  <input type="button" value="随机生成4位数" onclick="f1()">

script

	function f1(){
	var arr_4=new Array()
	function getRandom(min,max)													//开始取数
		{																						
																				//随机数
			var random = Math.random()*(max-min)+min;
																		//向下取整
			random = Math.floor(random);
		
			if(arr_4.length < 4)							//判断数组长度
			{	
				for(i=0;i<=arr_4.length;i++)				//遍历数组。
				{
					if(random==arr_4[i])					//比较随机数
					{	
						break;
					}
					else								
					{
						if(i==arr_4.length)
						{arr_4.push(random);break;}
					}
				};
				getRandom(0,10);
			}
			
		}
		getRandom(0,10);		//随机取0-9
	alert(arr_4)
	}

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