JavaScript do...while statement

　JavaScript-Anweisungen und Variablen-Deklarationen

do...whileThe statement creates a loop that executes the specified statement until the result of the test condition is false.

Condition (condition)Evaluate after executing the statement, resulting in the specified statement being executed at least once.

JavaScript provides the following types of loops:

• for - The loop iterates over the code block several times

• for...in - Iterate over the properties of an object

• while - The loop iterates over the code block when the specified condition is true

• do...while - The loop executes a code block once and then repeats the loop when the specified condition is true

UsebreakThe statement terminates the current loop and usescontinueThe statement skips the value in the loop.

Syntax:

do {　
　//Executed statements
}
while (condition);

var n = 0;
do {
　　　document.write("<br>The number is "　+　n);
　　　n++;
}
while (n <　5);

Note:If you want to use aCondition (condition)Initialize the variable before the loop, and then increment it within the loop. If you forget to increase the variable, the loop will never end. This will cause your browser to crash.

Browser compatibility

All browsers fully support the do ... while statement:

Parameter value

Technische Details

Mehr Beispiele

Selbst wenn die Bedingung false ist, wird dieser Loop mindestens einmal ausgeführt, da der Codeblock vor der Bedingungstest ausgeführt wird:

var n =　5;
do {
　　　document.write("<br>The number is "　+　n);
　　　n++;
}
while (n <　3);　　//　false

Zusammenhängende Referenzen

JavaScript Referenz:JavaScript while-Anweisung

JavaScript Referenz:JavaScript break-Anweisung

JavaScript Referenz:JavaScript continue-Deklaration

　JavaScript-Anweisungen und Variablen-Deklarationen