What are the loop structures provided by javascript?

The loop structures provided by JavaScript include: 1. for loop, which traverses the code block multiple times; 2. for/in loop, which traverses the object properties; 3. while loop, which loops through a block of code when the specified condition is true. ; 4. Do/while loop, loops a block of code when the specified condition is true.

The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.

What are the loop structures provided by JavaScript?

If you need to run the code multiple times, using different values ​​each time, a loop is very convenient to use.

JavaScript supports different types of loops:

1.for - Traverse a code block multiple times

The syntax of a for loop is as follows:

for (语句 1; 语句 2; 语句 3) {
     要执行的代码块
}

2.for /in - Traverse object properties

Syntax

for (key in object) {
  // code block to be executed
}

3.while - Loop a block of code when the specified condition is true

Syntax

while (条件) {
    要执行的代码块
}

4. do/while - Loop a block of code when the specified condition is true

Syntax

do {
    要执行的代码块
}

while (条件);

For knowledge about javascript loops, please check "javascript loop#" in the javascript manual ##"chapter.

Video tutorial recommendation: "

javascript basic tutorial"

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