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break
Terminates the current while or for loop and transfers program control to the statement following the terminated loop.
| 实现版本 | Navigator 2.0, LiveWire 1.0 |
| label | Identifier associated with the label of the statement. |
描述
The break statement can now include an optional label that allows the program to break out of a labeled statement. This type of break must be in a statement identified by the label used by break.
The statements in a labeled statement can be of any type.
示例
The following function has a break statement that terminates the while loop when e is 3, and then returns the value 3 * x.
function testBreak(x) {
var i = 0
while (i < 6) {
if (i == 3)
break
i++
}
return i*x
}
In the following example, a statement labeled checkiandj contains a statement labeled checkj. If break is encountered, the program breaks out of the checkj statement and continues with the remainder of the checkiandj statement. If break had a label of checkiandj, the program would break out of the checkiandj statement and continue at the statement following checkiandj.
checkiandj :
if (4==i) {
document.write("You've entered " + i + ".<BR>");
checkj :
if (2==j) {
document.write("You've entered " + j + ".<BR>");
break checkj;
document.write("The sum is " + (i+j) + ".<BR>");
}
document.write(i + "-" + j + "=" + (i-j) + ".<BR>");
}
参看
labeled, switch
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