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This article mainly explains "what are the choice sentences in javascript", friends who are interested may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what are the choice statements in javascript"?

Select statements are: 1, if statement, syntax "if (conditional expression) {/ / code} else {/ / code}"; 2, switch statement, syntax "switch (expression) {case value: statement; break;..}"; 3, ternary operation statement, syntax "conditional expression? expression 1: expression 2;"

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

1. If statement

This place is similar to a common language and has the following format:

If (test condition) {execute when the test condition is true} else {execute when the test condition is false}

Else can be omitted, such as the following

If (test condition) {test condition is executed when it is true}

You can use curly braces when you have a single line, for example

If (3 > 6) alert ("A"); else alert ("B")

Multi-branch if statement

This is similar to other languages, where multiple branches are executed only once. The format is as follows:

If (test condition 1) {test condition 1true execution statement} else if (test condition 2) {test condition 2true execution statement} else if (test condition) {test condition 3true execution statement} else {test condition 4true execution statement}

Nesting of if statements

If (test condition) {if (test condition) {execute} 2, switch statements when the test condition is true

Same as c, the syntax format is as follows:

Switch (variable) {case value 1: statement executed equal to value 1; break; case value 2: statement executed equal to value 2; break; case value 3: statement executed equal to value 3; break Case value 4: a statement executed equal to value 4; break; default: a statement that is not equal to the above values; break;} 3, ternary operation

Similar to c, the format is as follows:

Conditional expression? Expression 1: expression 2; at this point, I believe you have a deeper understanding of "which choice statements in javascript". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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