生成隨機數 ,隨機密碼
阿新 • • 發佈:2020-11-13
一 、生成[n,m]的隨機整數
函式功能:生成[n,m]的隨機整數。
在js生成驗證碼或者隨機選中一個選項時很有用
//生成從minNum到maxNum的隨機數 function randomNum(minNum,maxNum){ switch(arguments.length){ case 1: return parseInt(Math.random()*minNum+1,10); break; case 2: return parseInt(Math.random()*(maxNum-minNum+1)+minNum,10); break; default: return 0; break; } }
二 、生成n位數的隨機密碼
function randomPassword(length) { length = Number(length) // Limit length if (length < 6) { length = 6 } else if (length > 16) { length = 16 } let passwordArray= ['ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz', '1234567890', '!@#$%&*.']; var password = []; let n = 0; for (let i = 0; i < length; i++) { // If password length less than 9, all value random if ( password.length < (length - 4) ) { // Get random passwordArray indexlet arrayRandom = Math.floor(Math.random() * 4); // Get password array value let passwordItem = passwordArray[arrayRandom]; // Get password array value random index // Get random real value let item = passwordItem[Math.floor(Math.random() * passwordItem.length)]; password.push(item); } else { // If password large then 9, lastest 4 password will push in according to the random password index // Get the array values sequentially let newItem = passwordArray[n]; let lastItem = newItem[Math.floor(Math.random() * newItem.length)]; // Get array splice index let spliceIndex = Math.floor(Math.random() * password.length); password.splice(spliceIndex, 0, lastItem); n++ } } return password.join(""); }