<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> #useballs{ display: flex; } span{ width: 50px; height: 50px; border-radius: 50%; text-align: center; line-height: 50px; color: white; font-weight: bolder; margin: 20px; } .red{ background: red; } .blue{ background: blue; } </style> </head> <body> <div id="useballs"> </div> <button id="button">随机选</button> <script> //生成球的数字 function makeball(n,min,max) { let nums = []; for (let i=0;i<n;i++){ let num = Math.round(Math.random()*(max-min)+min); if(nums.indexOf(num) === -1){ nums.push(num); }else{ i--; } } return nums; } let redballs = makeball(6,1,33); let blueballs = makeball(1,1,16); function run (arr,classname){ for(let i=0;i<arr.length;i++){ useballs.innerHTML+=`<span class="${classname}">${arr[i]}</span>` } } run(redballs,"red"); run(blueballs,"blue"); button.onclick=function(){ location.reload() } </script> </body> </html>
双色球随机数练习
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转载自www.cnblogs.com/13330893721zhy/p/11434376.html
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