continue

continue 声明终止当前循环或标记循环的当前迭代中的语句执行,并在下一次迭代时继续执行循环。

语法

continue [ label ];
label
标识标号关联的语句

描述

break 语句的区别在于, continue 并不会终止循环的迭代,而是:

  • while 循环中,控制流跳转回条件判断;
  • for 循环中,控制流跳转到更新语句。

continue 语句可以包含一个可选的标号以控制程序跳转到指定循环的下一次迭代,而非当前循环。此时要求 continue 语句在对应的循环内部。

示例

while 语句中使用 continue

下述例子展示了一个在i 为 3时执行continue 语句的 while 循环。因此,n 的值在几次迭代后分别为 1, 3, 7 和 12 .

i = 0;
n = 0;
while (i < 5) {
   i++;
   if (i === 3) {
      continue;
   }
   n += i;
}

使用带 label 的 continue

在下面的例子中,被标记为 checkiandj 的语句包含一个被标记为 checkj 的语句。当遇到continue 语句时,程序回到 checkj 语句的开始继续执行。每次遇到 continue 时,再次执行 checkj ,直到条件判断返回 false 。之后完成 checkiandj 语句剩下的部分。

但如果 continue 的标号被改为 checkiandj ,那程序将会从 checkiandj 语句的开始继续运行。

参考 label

var i = 0, 
    j = 8;

checkiandj: while (i < 4) {
   console.log("i: " + i);
   i += 1;

   checkj: while (j > 4) {
      console.log("j: "+ j);
      j -= 1;
      if ((j % 2) == 0)
         continue checkj;
      console.log(j + " is odd.");
   }
   console.log("i = " + i);
   console.log("j = " + j);
}

输出:

"i: 0"

// start checkj
"j: 8"
"7 is odd."
"j: 7"
"j: 6"
"5 is odd."
"j: 5"
// end checkj

"i = 1" 
"j = 4" 

"i: 1"
"i = 2" 
"j = 4"

"i: 2"
"i = 3"
"j = 4"

"i: 3"
"i = 4"
"j = 4"

规范

Specification Status Comment
ECMAScript 1st Edition (ECMA-262) Standard Initial definition. Unlabeled version.
ECMAScript 3rd Edition (ECMA-262) Standard Labeled version added.
ECMAScript 5.1 (ECMA-262)
Continue statement
Standard
ECMAScript 2015 (6th Edition, ECMA-262)
Continue statement
Standard
ECMAScript (ECMA-262)
Continue statement
Living Standard

浏览器兼容性

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
continueChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 3Opera Full support 4Safari Full support 1WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 10.1Safari iOS Full support 1Samsung Internet Android Full support 1.0nodejs Full support Yes

Legend

Full support  
Full support

See also