考虑:
var myArray = ['January', 'February', 'March'];
如何使用JavaScript从这个数组中选择一个随机值?
当前回答
最短的版本: var myArray = ['January'， 'February'， 'March']; var rand = myArray[(Math.random() * myArray.length) | 0] console.log (rand)
其他回答
编辑Array原型可能有害。这里是一个简单的函数来完成这项工作。
function getArrayRandomElement (arr) {
if (arr && arr.length) {
return arr[Math.floor(Math.random() * arr.length)];
}
// The undefined will be returned if the empty array was passed
}
用法:
// Example 1
var item = getArrayRandomElement(['January', 'February', 'March']);
// Example 2
var myArray = ['January', 'February', 'March'];
var item = getArrayRandomElement(myArray);
Faker.js有许多生成随机测试数据的实用函数。在测试套件的上下文中，这是一个很好的选择:
const faker = require('faker');
faker.helpers.arrayElement(['January', 'February', 'March']);
正如评论者所提到的，您通常不应该在产品代码中使用这个库。
下面是一个如何做到这一点的例子:
$scope.ctx.skills = data.result.skills;
$scope.praiseTextArray = [
"Hooray",
"You\'re ready to move to a new skill",
"Yahoo! You completed a problem",
"You\'re doing great",
"You succeeded",
"That was a brave effort trying new problems",
"Your brain was working hard",
"All your hard work is paying off",
"Very nice job!, Let\'s see what you can do next",
"Well done",
"That was excellent work",
"Awesome job",
"You must feel good about doing such a great job",
"Right on",
"Great thinking",
"Wonderful work",
"You were right on top of that one",
"Beautiful job",
"Way to go",
"Sensational effort"
];
$scope.praiseTextWord = $scope.praiseTextArray[Math.floor(Math.random()*$scope.praiseTextArray.length)];
这是一个简单的一行代码:
const randomElement = array[Math.floor(Math.random() * array.length)];
例如:
const月=(“1”,“2”,“3”、“4”,“可能”,“6”,“7”); const random = Math.floor(Math.random() * months.length); console.log(随机、几个月(随机));
我找到了一种方法来解决顶部答案的复杂性，只需将变量rand连接到另一个变量，允许该数字在myArray[];的调用中显示。通过删除创建的新数组并处理它的复杂性，我提出了一个可行的解决方案:
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var myArray = ['January', 'February', 'March', 'April', 'May'];
var rand = Math.floor(Math.random() * myArray.length);
var concat = myArray[rand];
function random() {
document.getElementById("demo").innerHTML = (concat);
}
</script>
<button onClick="random();">
Working Random Array generator
</button>
</body>
</html>
