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面试准备

JavaScript 面试题与答案

Test your skills through the online practice test: JavaScript Quiz Online Practice Test

问题 1. What are JavaScript data types?

Number
String
Boolean
Function
Object
Null
Undefined.

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问题 2. How do you convert numbers between different bases in JavaScript?

Use the parseInt() function, that takes a string as the first parameter, and the base as a second parameter. So to convert hexadecimal 3F to decimal, use parseInt ("3F", 16);

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问题 3. What does isNaN function do?

Return true if the argument is not a number.

Example:

isNaN(123) //returns false

isNaN('Hello John') //returns true

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问题 4. What looping structures are there in JavaScript?

Looping structures are:

for
while
do-while
foreach

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问题 5. What boolean operators does JavaScript support?

Boolean operators in JavaScript are:

&&
||
!

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JavaScript 面试题与答案

相关差异对比

问题 1. What are JavaScript data types?

问题 2. How do you convert numbers between different bases in JavaScript?

问题 3. What does isNaN function do?

问题 4. What looping structures are there in JavaScript?

问题 5. What boolean operators does JavaScript support?

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