javascript中的三元opeartor [英] Ternary opeartor in javascript

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本文介绍了javascript中的三元opeartor的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我使用的是jQuery,平台是Visual Code。我是Mean Stack的新手。我正在使用三元运算符来练习。我做了一个程序,但它并没有按我的意愿给我输出。我不确定这个问题。我希望用户输入年龄并通过三元运算符给出输出。当我运行cmd时,它运行程序并打印你的年龄是多少并向我显示 ReferenceError:提示未定义

谁能告诉我哪里错了?



我尝试了什么:



  var  name = prompt(' 你的年龄是多少?'); 
console.log(name);
var 年龄;
var voteable =(age < 18 )? 太年轻了 足够老;

解决方案

试试这个



  var  age = prompt(' 你的年龄是多少?'); 
var voteable =(age < 18 )? 太年轻了 够老;
alert(可投票);



您尚未将提示中的值分配给年龄变量。


I am using jQuery and platform is Visual Code. And I'm a newbie in Mean Stack. I am using Ternary Operator to practice. I made a program, but it's not giving me the output as I want. I'm not certain about the problem. I want the user to enter the age and give me output as done by the ternary operator. When I run cmd, it runs the program and print 'What's is your age' and shows me ReferenceError: prompt is not defined.
Can anybody tell me where I am wrong?

What I have tried:

var name = prompt('What is your age?');
console.log(name);
var age;
var voteable = (age < 18) ? "Too young":"Old enough";

解决方案

try this

var age = prompt('What is your age?');
       var voteable = (age < 18) ? "Too young" : "Old enough";
       alert(voteable);


you have not assigned the value from prompt to age variable.


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