JavaScript break statement

　JavaScript Statements and Variable Declarations

breakstatement terminates the current loop, switch, or label statement, and transfers program control to the statement after the terminating statement.

When the break statement is used with a switch statement, it will exit the switch block. This will stop executing more code or performing case tests within the block.

When using the break statement in a loop, it will break out of the loop and continue executing the code after the loop.

The break statement includes an optionalLabel, theLabelAllows the program to exit a labeled statement (see the following 'More examples').

Syntax:

break label;

var text = "";
for (let i = 0; i <　6; i++) {
if (i ===　3) {
　　　break;
}
text　+= "The number is "　+　i　+　"<br>";
}

Browser compatibility

All browsers fully support the break statement:

Parameter value

Technical details

More examples

The following function has a break statement, when i is3Terminates the while loop and returns the value3 * x：

function testBreak(x) {
　　var i = 0;
　　while (i <　6) {
if (i ==　3) {
　　　break;
}
i++;
　　}
　　return i　*　x;
}

This example exits a switch block to ensure that only one case is executed:

var day;
switch (new Date().getDay()) {
case 0: day = "Sunday";
break;
case　1: day = "Monday";
break;
case　2: day = "Tuesday";
break;
case　3: day = "Wednesday";
break;
case　4: day = "Thursday";
break;
case　5: day = "Friday";
break;
case　6: day = "Saturday";
break;
}

The following code uses a labeled break statement to 'exit' a JavaScript code block:

outer_block: {
　　inner_block: {
　document.writeln('1');
　break outer_block;//　Exit from inner_block and outer_block
　document.writeln(':-(');　//　skipped
　　}
　　document.writeln('2');　//　skipped
}

Also check out

JavaScript Tutorial:JavaScript break and continue

JavaScript Tutorial:JavaScript for Loop

JavaScript Tutorial:JavaScript while Loop

JavaScript Tutorial:JavaScript switch

JavaScript Reference:JavaScript continue Statement

JavaScript Reference: JavaScript for Statement

JavaScript Reference: JavaScript while Statement

JavaScript Reference: JavaScript switch Statement

　JavaScript Statements and Variable Declarations