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This article mainly explains "how to use WeChat Mini Programs's if, switch, for and while sentences". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn how to use WeChat Mini Programs's if, switch, for and while sentences.

If statement

In WXS, you can use if statements in the following format:

If (expression) statement: executes statement when expression is truthy.

If (expression) statement1 else statement2: executes statement1 when expression is truthy. Otherwise, execute statement2

If... Else if... Through this sentence pattern, else statementN can choose between statement1 and statementN to execute.

Example syntax:

/ / if... if (expression) statement; if (expression) statement; if (expression) {code block;} / / if. Else if (expression) statement; else statement; if (expression) statement; else statement; if (expression) {code block;} else {code block;} / / if. Else if... Else... if (expression) {code block;} else {code block;} switch statement

Example syntax:

Switch (expression) {case variable: statement; case number: statement; break; case string: statement; default: statement;}

The default branch can be omitted or not written.

Case keywords can only be used after: variables, numbers, strings.

Sample code:

Var exp = 10 switch (exp) {case "10": console.log ("string 10"); break;case 10: console.log ("number 10"); break;case exp: console.log ("var exp"); break;default: console.log ("default");}

Output:

Number 10for statement

Example syntax:

For (statement; statement) statement; for (statement; statement) {code block;}

The use of break,continue keywords is supported.

Sample code:

For (var I = 0; I

= 1) break;}

Output:

01while statement

Example syntax:

While (expression) statement; while (expression) {code block;} do {code block;} while (expression)

When the expression is true, the statement or block of code is executed in a loop.

The use of break,continue keywords is supported.

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