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
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)];
其他回答
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>
如果您有固定的值(如月份名称列表)，并且想要一行解决方案
var result = ['January', 'February', 'March'][Math.floor(Math.random() * 3)]
数组的第二部分是一个访问操作，如在JavaScript中为什么[5,6,8,7][1,2]= 8所描述的那样?
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)];
Randojs使这更简单和可读:
console.log(rando(['January'， 'February'， 'March'])。值); < script src = " https://randojs.com/1.0.0.js " > < /脚本>
var item = myArray[Math.floor（Math.random（）*myArray.length）];
或相当短的版本:
var item = myArray[（Math.random（）*myArray.length）|0];
示例代码:
var myArray = ['January'， 'February'， 'March']; var item = myArray[(Math.random()*myArray.length)|0]; console.log(“项目:”,项目);
