/zh-cn/docs/commands/Until.htm

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  4. <title>Until | AutoHotkey</title>
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  5. <meta name="description" content="The Until statement applies a condition to the continuation of a Loop or For-loop." />
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  14. <h1>Until <span class="ver">[AHK_L 59+]</span></h1>
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  16. <p>根据条件判断是否继续执行 Loop 或 For 循环.</p>
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  18. <pre class="Syntax">
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  19. <span class="func">Loop</span> {
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  20.     ...
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  21. } <span class="func">Until</span> <i>Expression</i>
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  22. </pre>
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  23. <h2 id="Parameters">参数</h2>
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  24. <dl>
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  26.   <dt>Expression</dt>
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  27.   <dd><p>任何有效的<a href="../Variables.htm#Expressions">表达式</a>.</p></dd>
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  29. </dl>
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  31. <h2 id="Remarks">备注</h2>
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  32. <p>在每次重复执行后都会计算一次表达式, 即使使用了 <a href="Continue.htm">continue</a> 也会进行计算. 如果表达式计算结果为 false(即为空字符串或数值 0), 循环继续; 否则循环被打破且跳到 <i>Until</i> 之后一行执行.</p>
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  33. <p>Loop Until 是下列结构的简写形式:</p>
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  34. <pre>Loop {
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  35.     ...
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  36.     if (<i>Expression</i>)
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  37.         break
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  38. }</pre>
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  39. <p>不过, Loop Until 通常更容易理解, 且与上面不同的是, 它还可以使用单行动作. 例如:</p>
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  40. <pre>Loop
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  41.     x *= 2
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  42. Until x &gt; y</pre>
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  43. <p><i>Until</i> 可以使用在任何 Loop 或 For 循环中. 例如:</p>
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  44. <pre>Loop, Read, %A_ScriptFullPath%
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  45.     lines .= A_LoopReadLine . "`n"
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  46. Until A_Index=5  <em>; 读取前五行.</em>
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  47. MsgBox % lines
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  48. </pre>
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  49. <p>如果 <a href="../Variables.htm#Index">A_Index</a> 用在 <i>Expression</i> 中, 那么它的值为刚结束的那次循环的索引.</p>
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  51. <h2 id="Related">相关</h2>
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  52. <p><a href="Loop.htm">Loop</a>, <a href="While.htm">While 循环</a>, <a href="For.htm">For 循环</a>, <a href="Break.htm">Break</a>, <a href="Continue.htm">Continue</a>, <a href="Block.htm">区块</a>, <a href="LoopFile.htm">文件和文件夹循环</a>, <a href="LoopReg.htm">注册表循环</a>, <a href="LoopReadFile.htm">文件读取循环</a>, <a href="LoopParse.htm">解析循环</a>, <a href="IfExpression.htm">If (表达式)</a></p>
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