JavaScript语言参考手册_语句

JavaScript

 
 JavaScript手册 
目录
此参考中包含
的内容
轻松上手
简介
操作符
语句
核心
文档
窗口
表单
浏览器
事件和
事件句柄
LiveWire
数据库服务
进程管理服务
实用工具
全局函数
LiveConnect
的Java包
索引
版权
 
【目录】 【上一页】 【下一页】 【索引】

continue

Terminates execution of the block of statements in a while or for loop, and continues execution of the loop with the next iteration.

实现版本 Navigator 2.0, LiveWire 1.0

语法

continue
continue label

Argument

label Identifier associated with the label of the statement.

描述

In contrast to the break statement, continue does not terminate the execution of the loop entirely: instead,

  • In a while loop, it jumps back to the condition.
  • In a for loop, it jumps to the update expression.
The continue statement can now include an optional label that allows the program to terminate execution of a labeled statement and continue to the specified labeled statement. This type of continue must be in a looping statement identified by the label used by continue.

示例

The following example shows a while loop that has a continue statement that executes when the value of i is 3. Thus, n takes on the values 1, 3, 7, and 12.

i = 0
n = 0
while (i < 5) {
   i++
   if (i == 3)
      continue
   n += i
}
In the following example, a statement labeled checkiandj contains a statement labeled checkj. If continue is encountered, the program continues at the top of the checkj statement. Each time continue is encountered, checkj reiterates until its condition returns false. When false is returned, the remainder of the checkiandj statement is completed. checkiandj reiterates until its condition returns false. When false is returned, the program continues at the statement following checkiandj.

If continue had a label of checkiandj, the program would continue at the top of the checkiandj statement.

checkiandj :
while (i<4) {
   document.write(i + "<BR>");
   i+=1;
   checkj :
   while (j>4) {
      document.write(j + "<BR>");
      j-=1;
      if ((j%2)==0)
         continue checkj;
      document.write(j + " is odd.<BR>");
   }
   document.write("i = " + i + "<br>");
   document.write("j = " + j + "<br>");
}

参看

labeled


【目录】 【上一页】 【下一页】 【索引】

回页面顶部