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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 11. What's relationship between JavaScript and ECMAScript?

ECMAScript is yet another name for JavaScript (other names include LiveScript). The current JavaScript that you see supported in browsers is ECMAScript revision 3.

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问题 12. What is negative infinity?

It's a number in JavaScript, derived by dividing negative number by zero.

You can only use it as Number.NEGATIVE_INFINITY. The value of this attribute is -Infinity.

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问题 13. What is this keyword?

It refers to the current object.

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问题 14. What is Javascript?

A scripting language is a simple, interpreted programming language.
Scripts are embedded as plain text, interpreted by application.

Simpler execution model: don't need compiler or development environment.
Saves bandwidth: source code is downloaded, not compiled executable.
Platform-independence: code interpreted by any script-enabled browser.

But: slower than compiled code, not as powerful/full-featured.

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问题 15. What is identifier in Javascript?

Identifier– The name of a variable (or function)
Starts with a letter, can contains digits & underscores
Case Sensitive!!
Should be meaningful to someone reading your code
Good: accountBalance, amountDue

Bad: bal, due,

Just plain wrong: 2bOrNotToBe, +var, total-value

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JavaScript 面试题与答案

相关差异对比

问题 11. What's relationship between JavaScript and ECMAScript?

问题 12. What is negative infinity?

问题 13. What is this keyword?

问题 14. What is Javascript?

问题 15. What is identifier in Javascript?

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