blocks|key|1390588|text|\n将在-+\n中放入一个新的行，作为新行的控制代码。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1390589|​|1390590|alert("Line+1\nLine+2");|code-block|syntax|javascript|1390591|1390592|entityMap^0|0|2|6|2|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|V|8|@]|D|@]|E|$K|L]]|$1|M|3|G|5|6|7|W|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|O|$]]

<p><code>\n</code> will put a new line in - <code>\n</code> being a control code for new line.</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>alert("Line 1\nLine 2");</code></pre>
</div>
</div>
</p>


blocks|key|1390642|text|您必须使用双引号来显示特殊字符，如\n+\t等...在js警告框中查看php脚本中的示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1390643|$string+=+'Hello+everybody+\n+this+is+an+alert+box';
echo+"<script>alert(\"$string\")</script>";|code-block|syntax|javascript|1390644|但是，当您想要显示在双引号中指定的字符串时，第二个可能的问题就出现了。|1390645|请参阅link+text|offset|length|1390646|如果字符串括在双引号(")中，PHP将解释更多特殊字符的转义序列|1390647|转义序列\n被转换为0x0A+ASCII转义字符，此字符不会显示在警告框中。解决方案在于转义这个特殊的序列：|1390648|$s+=+"Hello+everybody+\\n+this+is+an+alert+box";
echo+"<script>alert(\"$string\")</script>";|1390649|如果您不知道字符串是如何封闭的，则必须将特殊字符转换为它们的转义序列|1390650|$patterns+=+array("/\\\\/",+'/\n/',+'/\r/',+'/\t/',+'/\v/',+'/\f/');
$replacements+=+array('\\\\\\',+'\n',+'\r',+'\t',+'\v',+'\f');
$string+=+preg_replace($patterns,+$replacements,+$string);
echo+"<script>alert(\"$string\")</script>";|1390651|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/language.types.string.php^0|0|0|0|3|9|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|16|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|17|8|@]|9|@$K|18|L|19|1|1A]]|A|$]]|$1|M|3|N|5|6|7|1B|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|1D|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|1E|8|@]|9|@]|A|$]]|$1|U|3|V|5|D|7|1F|8|@]|9|@]|A|$E|F]]|$1|W|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]]]

<p>you have to use double quotes to display special char like \n \t etc... in js alert box
for exemple in php script:</p>

<pre><code>$string = 'Hello everybody \n this is an alert box';
echo "&lt;script&gt;alert(\"$string\")&lt;/script&gt;";
</code></pre>

<p>But a second possible problem arrives when you want to display a string specified in double quoted. </p>

<p>see <a href="http://www.php.net/manual/en/language.types.string.php" rel="noreferrer">link text</a></p>

<p>If the string is enclosed in double-quotes ("), PHP will interpret more escape sequences for special characters</p>

<p>escape sequences \n is transformed as 0x0A ASCII Escaped character and this character is not displayed in the alert box. The solution consists in to escape this special sequence:</p>

<pre><code>$s = "Hello everybody \\n this is an alert box";
echo "&lt;script&gt;alert(\"$string\")&lt;/script&gt;";
</code></pre>

<p>if you don't know how the string is enclosed you have to transform special characters to their escape sequences</p>

<pre><code>$patterns = array("/\\\\/", '/\n/', '/\r/', '/\t/', '/\v/', '/\f/');
$replacements = array('\\\\\\', '\n', '\r', '\t', '\v', '\f');
$string = preg_replace($patterns, $replacements, $string);
echo "&lt;script&gt;alert(\"$string\")&lt;/script&gt;";
</code></pre>


blocks|key|1390896|text|JavaScript中的特殊字符代码列表：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1390897|Code++++Outputs
\'++single+quote
\"++double+quote
\\++backslash
\n++new+line
\r++carriage+return
\t++tab
\b++backspace
\f++form+feed|code-block|syntax|javascript|1390898|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>List of Special Character codes in JavaScript:</p>

<pre><code>Code    Outputs
\'  single quote
\"  double quote
\\  backslash
\n  new line
\r  carriage return
\t  tab
\b  backspace
\f  form feed
</code></pre>


blocks|key|1175389|text|alert("text\nnew+Line+Text");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1175390|文档：Window.alert()|unstyled|offset|length|style|CODE|1175391|1175392|Firefox：|1175393|📷|atomic|1175394|​|1175395|Chrome：|1175396|1175397|1175398|边缘：|1175399|1175400|1175401|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/docs/Web/API/Window/alert|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/7f8a16e861c6144c2820a47eddbe7c7b.png|imageAlt|2|https://ask.qcloudimg.com/http-save/yehe-900000/b183fca703f432442e03eddb7c8b840f.png|3|https://ask.qcloudimg.com/http-save/yehe-900000/a74df7e88bd3d8b95cb3b91fdbf93ba5.png^0|0|3|E|3|E|0|0|0|0|0|1|1|0|0|0|0|1|2|0|0|0|0|1|3|0|0^^$0|@$1|2|3|4|5|6|7|1I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|1J|8|@$G|1K|H|1L|I|J]]|9|@$G|1M|H|1N|1|1O]]|A|$]]|$1|K|3|-4|5|F|7|1P|8|@]|9|@]|A|$]]|$1|L|3|M|5|F|7|1Q|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1R|8|@]|9|@$G|1S|H|1T|1|1U]]|A|$]]|$1|Q|3|R|5|F|7|1V|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|1W|8|@]|9|@]|A|$]]|$1|U|3|O|5|P|7|1X|8|@]|9|@$G|1Y|H|1Z|1|20]]|A|$]]|$1|V|3|R|5|F|7|21|8|@]|9|@]|A|$]]|$1|W|3|X|5|F|7|22|8|@]|9|@]|A|$]]|$1|Y|3|O|5|P|7|23|8|@]|9|@$G|24|H|25|1|26]]|A|$]]|$1|Z|3|R|5|F|7|27|8|@]|9|@]|A|$]]|$1|10|3|-4|5|F|7|28|8|@]|9|@]|A|$]]]|11|$12|$5|13|14|15|A|$16|17]]|18|$5|19|14|1A|A|$1B|1C|1D|-4]]|1E|$5|19|14|1A|A|$1B|1F|1D|-4]]|1G|$5|19|14|1A|A|$1B|1H|1D|-4]]]]

<pre><code>alert(&quot;text\nnew Line Text&quot;);
</code></pre>
<p>Documentation: <a href="https://developer.mozilla.org/docs/Web/API/Window/alert" rel="nofollow noreferrer"><code>Window.alert()</code></a></p>
<hr />
<p>Firefox:<br />
<img src="https://i.stack.imgur.com/gIsAT.png" alt="firefox demo" /></p>
<p>Chrome:<br />
<img src="https://i.stack.imgur.com/I4IxA.png" alt="chrome demo" /></p>
<p>Edge:<br />
<img src="https://i.stack.imgur.com/LJwIY.png" alt="edge demo" /></p>


blocks|key|1175880|text|当你想从一个php变量中写入javascript+alert时，你必须在"\n“前添加另一个"\”。相反，警报弹出窗口不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1175881|例如：|1175882|PHP+:
$text+=+"Example+Text+:+\n"
$text2+=+"Example+Text+:+\\n"

JS:
window.alert('<?php+echo+$text;+?>');++//+not+working
window.alert('<?php+echo+$text2;+?>');++//+is+working|code-block|syntax|javascript|1175883|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>When you want to write in javascript alert from a php variable, you have to add an other "\" before "\n".
Instead the alert pop-up is not working.</p>

<p>ex: </p>

<pre><code>PHP :
$text = "Example Text : \n"
$text2 = "Example Text : \\n"

JS:
window.alert('&lt;?php echo $text; ?&gt;');  // not working
window.alert('&lt;?php echo $text2; ?&gt;');  // is working
</code></pre>


blocks|key|1175209|text|以防万一这对任何人都有帮助，当我在后台的C#代码中执行此操作时，我必须使用双重转义字符，或者我得到一个“未终止的字符串常量”JavaScript错误：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1175210|ScriptManager.RegisterStartupScript(this,+this.GetType(),+"scriptName",+"alert(\"Line+1.\\n\\nLine+2.\");",+true);|code-block|syntax|javascript|1175211|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Just in case this helps anyone, when doing this from C# code behind I had to use a double escape character or I got an "unterminated string constant" JavaScript error:</p>

<pre><code>ScriptManager.RegisterStartupScript(this, this.GetType(), "scriptName", "alert(\"Line 1.\\n\\nLine 2.\");", true);
</code></pre>


blocks|key|1390742|text|适用于\n，但如果脚本是java标记，则必须编写\\\n|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1390743|<script+type="text/javascript">alert('text\ntext');</script>|code-block|syntax|javascript|1390744|或|1390745|<h:commandButton+action="#{XXXXXXX.xxxxxxxxxx}"+value="XXXXXXXX"+
++++onclick="alert('text\\\ntext');"+/>|1390746|entityMap^0|3|2|O|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

<p>Works with <code>\n</code> but if the script is into a java tag you must write <code>\\\n</code></p>

<pre><code>&lt;script type="text/javascript"&gt;alert('text\ntext');&lt;/script&gt;
</code></pre>

<p>or</p>

<pre><code>&lt;h:commandButton action="#{XXXXXXX.xxxxxxxxxx}" value="XXXXXXXX" 
    onclick="alert('text\\\ntext');" /&gt;
</code></pre>


blocks|key|1175942|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1175943|alert('The+transaction+has+been+approved.\nThank+you');|code-block|syntax|javascript|1175944|1175945|只需添加一个换行\n字符。|1175946|alert('The+transaction+has+been+approved.\nThank+you');
//+++++++++++++++++++++++++++++++++++++++%5E%5E|1175947|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|O|8|@]|9|@]|A|$E|F]]|$1|G|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Q|8|@]|9|@]|A|$]]|$1|J|3|K|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|L|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|M|$]]

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>alert('The transaction has been approved.\nThank you');</code></pre>
</div>
</div>
</p>

<p>Just add a newline \n character.</p>

<pre><code>alert('The transaction has been approved.\nThank you');
//                                       ^^
</code></pre>


blocks|key|1175999|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1176000|+alert("some+text\nmore+text+in+a+new+line");|code-block|syntax|javascript|1176001|1176002|1176003|alert("Line+1\nLine+2\nLine+3\nLine+4\nLine+5");|1176004|1176005|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|O|8|@]|9|@]|A|$E|F]]|$1|G|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|H|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

<p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code> alert("some text\nmore text in a new line");</code></pre>
</div>
</div>
</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>alert("Line 1\nLine 2\nLine 3\nLine 4\nLine 5");</code></pre>
</div>
</div>
</p>


blocks|key|1176049|text|从ECMAScript+2015开始，您可以使用反划线()将多行字符串的Template+Literals括起来，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1176050|​|1176051|alert(`Line1
Line2`);|code-block|syntax|javascript|1176052|1176053|输出：|1176054|Line1
Line2|1176055|entityMap|0|LINK|mutability|MUTABLE|url|https://www.ecma-international.org/ecma-262/6.0/#sec-template-literals|1|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals^0|1|F|0|10|H|1|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]|$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|6|7|16|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|17|8|@]|9|@]|C|$I|J]]|$1|K|3|E|5|6|7|18|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|19|8|@]|9|@]|C|$]]|$1|N|3|O|5|H|7|1A|8|@]|9|@]|C|$I|J]]|$1|P|3|-4|5|6|7|1B|8|@]|9|@]|C|$]]]|Q|$R|$5|S|T|U|C|$V|W]]|X|$5|S|T|U|C|$V|Y]]]]

<p>As of <a href="https://www.ecma-international.org/ecma-262/6.0/#sec-template-literals" rel="nofollow noreferrer">ECMAScript 2015</a> you can use back-ticks (` `) to enclose <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals" rel="nofollow noreferrer">Template Literals</a> for multi-line strings like this:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>alert(`Line1
Line2`);</code></pre>
</div>
</div>
</p>

<p>Outputs:</p>

<pre><code>Line1
Line2
</code></pre>


blocks|key|1391012|text|谢谢你的提示。使用"%2B“符号是我能让它工作的唯一方法。这是将一些数字相加的函数的最后一行。我自己也在学习JavaScript：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1391013|alert("Line1:+The+sum+is++"+%2B+sum+%2B+"\n"+%2B+"Line+2");|code-block|syntax|javascript|1391014|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Thanks for the hints.  Using the "+" sign is the only way I could get it to work.  This is the last line of a function that adds some numbers.  I'm just learning JavaScript myself:</p>

<pre><code>alert("Line1: The sum is  " + sum + "\n" + "Line 2");
</code></pre>


blocks|key|1391070|text|但是，如果你在java代码中，\n将无法工作：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1391071|<%25+System.out.print("<script>alert('Some+\n+text')</script>");+%25>|code-block|syntax|javascript|1391072|我知道这不是一个答案，只是觉得这很重要。|1391073|entityMap^0|F|2|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

<p><code>\n</code> won't work if you're inside java code though:</p>

<pre><code>&lt;% System.out.print("&lt;script&gt;alert('Some \n text')&lt;/script&gt;"); %&gt;
</code></pre>

<p>I know its not an answer, just thought it was important.</p>


blocks|key|1391214|text|使用javascript的换行符，而不是‘\n’。例如："Hello\nWorld“使用"Hello\x0AWorld”它很有效！！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1391215|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

<p>use the new line character of a javascript instead of '\n'.. 
eg: "Hello\nWorld" use "Hello\x0AWorld" 
It works great!!</p>


blocks|key|1175833|text|我看到一些人在MVC中遇到了问题，所以...使用模型传递'\n‘的一种简单方法是使用HTML.Raw插入文本。帮我修好了。在下面的代码中，Model.Alert可以包含换行符，比如"Hello\nWorld"...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1175834|alert("@Html.Raw(Model.Alert)");|code-block|syntax|javascript|1175835|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>I saw some people had trouble with this in MVC, so... a simple way to pass '\n' using the Model, and in my case even using a translated text, is to use HTML.Raw to insert the text. That fixed it for me. In the code below, Model.Alert can contains newlines, like "Hello\nWorld"...</p>

<pre><code>alert("@Html.Raw(Model.Alert)");
</code></pre>


blocks|key|1176098|text|在JAVA应用程序中，如果从"properties“文件中读取消息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1176099|由于双重编译java-html，|1176100|你需要两次逃生。|1176101|jsp.msg.1=First+Line+\\nSecond+Line|code-block|syntax|javascript|1176102|将导致|1176103|First+Line
Second+Line|1176104|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|T|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

<p>In JAVA app, if message is read from "properties" file.</p>

<p>Due to double compilation java-html, </p>

<p>you'll need double escape.</p>

<pre><code>jsp.msg.1=First Line \\nSecond Line
</code></pre>

<p>will result in </p>

<pre><code>First Line
Second Line
</code></pre>


blocks|key|1175674|text|我使用了："\n\r“-它只适用于双引号。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1175675|var+fvalue+=+"foo";
var+svalue+=+"bar";
alert("My+first+value+is:+"+%2B+fvalue+%2B+"\n\rMy+second+value+is:+"+%2B+svalue);

will+alert+as:

My+first+value+is:+foo
My+second+value+is:+bar|code-block|syntax|javascript|1175676|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>I used: "\n\r" - it only works in double quotes though.</p>

<pre><code>var fvalue = "foo";
var svalue = "bar";
alert("My first value is: " + fvalue + "\n\rMy second value is: " + svalue);

will alert as:

My first value is: foo
My second value is: bar
</code></pre>


<p>How do you put in a new line into a JavaScript alert box? </p>


New line in JavaScript alert box

如何在JavaScript警告框中插入新行？

问JavaScript警告框中的新行
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