From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:40:17 -0500 Subject: initial commit --- .../reference/statements/do...while/index.html | 99 ++++++++++++++++++++++ 1 file changed, 99 insertions(+) create mode 100644 files/zh-cn/web/javascript/reference/statements/do...while/index.html (limited to 'files/zh-cn/web/javascript/reference/statements/do...while/index.html') diff --git a/files/zh-cn/web/javascript/reference/statements/do...while/index.html b/files/zh-cn/web/javascript/reference/statements/do...while/index.html new file mode 100644 index 0000000000..bd3fb46473 --- /dev/null +++ b/files/zh-cn/web/javascript/reference/statements/do...while/index.html @@ -0,0 +1,99 @@ +--- +title: do...while +slug: Web/JavaScript/Reference/Statements/do...while +tags: + - JavaScript + - Statement +translation_of: Web/JavaScript/Reference/Statements/do...while +--- +
+
{{jsSidebar("Statements")}}
+
+ +

do...while 语句创建一个执行指定语句的循环，直到condition值为 false。在执行statement 后检测condition，所以指定的statement至少执行一次。

+ +

语法

+ +
do
+   statement
+while (condition);
+
+ +
+
statement
+
执行至少一次的语句，并在每次 condition 值为真时重新执行。想执行多行语句，可使用{{jsxref("Statements/block", "block")}}语句（{ ... }）包裹这些语句。
+
+ +
+
condition
+
循环中每次都会计算的表达式。如果 condition 值为真， statement 会再次执行。当 condition 值为假，则跳到do...while之后的语句。
+
+ +

示例

+ +

使用 do...while

+ +

下面的例子中，do...while 循环至少迭代一次，并且继续迭代直到 i不再小于 5 时结束。

+ +

HTML 内容

+ +
<div id="example"></div>
+ +

JavaScript 内容

+ +
var result = '';
+var i = 0;
+do {
+   i += 1;
+   result += i + ' ';
+} while (i < 5);
+document.getElementById('example').innerHTML = result;
+ +

结果

+ +

{{ EmbedLiveSample('Examples') }}

+ +

规范

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
SpecificationStatusComment
{{SpecName('ES3')}}{{Spec2('ES3')}}Initial definition. Implemented in JavaScript 1.2
{{SpecName('ES5.1', '#sec-12.6.1', 'do-while statement')}}{{Spec2('ES5.1')}} 
{{SpecName('ES6', '#sec-do-while-statement', 'do-while statement')}}{{Spec2('ES6')}}Trailing ; is now optional.
{{SpecName('ESDraft', '#sec-do-while-statement', 'do-while statement')}}{{Spec2('ESDraft')}} 
+ +

浏览器兼容

+ + + +

{{Compat("javascript.statements.do_while")}}

+ +

相关链接

+ + -- cgit v1.2.3-54-g00ecf