javascript test for empty string

1. JavaScript overview 2. JavaScript Introduction method 3. JavaScript Language Specification 4. JavaScript Language Basics 5. JavaScript data type 6. JavaScript operators 7. JavaScript Process Control 8. JavaScript

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1) Intro Not long ago I set up a technology group in a MM asked a question like this, she posted the code as follows: var a = 1;function hehe (){Window.alert (a);var a = 2;Window.alert (a);}Hehe (); The results of the execution are as follows:

Summary of little knowledge about JavaScript performance optimization, and javascript Performance Optimization With the development of the network, network speed and machine speed, more and more websites use a variety of client technologies. Ajax is

I. OverviewStrings are almost ubiquitous in JavaScript, and when you are working with the user's input data, when you read or set the properties of a DOM object, while manipulating the cookie, there are of course more .... The core part of

Select title:Fill in the blanks questions:Question and Answer question:1. What is JavaScript? (This is the basic problem, for many programmers is also send sub-problem!) ）JavaScript is a client and server-side scripting language that can be inserted

A memory leak is a gradual decrease in available memory for a computer. Occurs when the program continues to fail to release the temporary memory it uses. JavaScript Web applications also frequently encounter memory-related problems in native

Four basic data types in javascript: numeric values (integers and real numbers), string literals (characters or values enclosed by "" or "), Boolean (make True or false), and null values. The data in the basic type of JavaScript can be constants or

javascript| Functions | tutorials | strings String functions that use JavaScript String objects provide many methods, but few programmers make the most of them, which, for a programmer, cannot be said to be a flaw. Strings provide methods that can

javascript| Functions | tutorials | string-string objects provide many methods, but few programmers make the most of them, which, for a programmer, cannot be said to be a flaw. Strings provide methods that can be used to manipulate characters,