如何從字符數組創建 3 個唯一值

Question

你能看看這個演示，讓我知道如何從一組數字中創建 3 個唯一值嗎？

 var num = []; var chances = "0123456789"; for (var i = 0; i < 3; i++) { num.push(chances.charAt(Math.floor(Math.random() * chances.length))); } console.log(num);

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Answer 1

你可以做這樣的事情

 var num = []; for (var i = 0; i < 3;) { var ran = Math.floor(Math.random() * 10); // You can generate random number between 0-9 using this , suggested by @Tushar if (num.indexOf(ran) == -1) // check number is already in array num[i++] = ran; // if not then push the value and increment i } document.write(num.join());

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為了獲得獨特的字母

 var res = [], alp = 'abcdefghijklmnopqrstuvwxyz'.split(''); // creating an array of alphabets for picking alphabers for (var i = 0; i < 3;) { var ran = Math.floor(Math.random() * 26); // You can generate random number between 0-25 using this if (res.indexOf(alp[ran]) == -1) // check alphabet is already in array res[i++] = alp[ran]; // if not then push the value and increment i } document.write(res.join());

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或者

 var res = [], alp = 'abcdefghijklmnopqrstuvwxyz'.split(''); // creating an array of alphabets for picking alphabers for (var i = 0; i < 3;) { var ran = Math.floor(Math.random() * 10000) % 26; // You can generate random number between 0-25 using this if (res.indexOf(alp[ran]) == -1) // check alphabet is already in array res[i++] = alp[ran]; // if not then push the value and increment i } document.write(res.join());

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Answer 2

你也可以試試這個代碼：

 var num = []; var chances = "0123456789"; var len = chances.length; var str; while (num.length < 3) { str = ""; while (str.length < len) str += chances[Math.floor((Math.random() * len) % len)]; if (-1 === num.indexOf(str)) num.push(str); } document.write(JSON.stringify(num));