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Examples of using switch expressions in js_javascript skills

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Release: 2016-05-16 17:22:16
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Foreword

Switch expressions are found in many languages, such as Java, C wait, and using switch is more convenient and clearer than using if else.

The usage syntax is very simple:
Copy code The code is as follows:

switch (n)
{
case 1:
Execute code block 1
break;
case 2:
Execute code block 2
break;
default:
n Code that is not executed simultaneously with case 1 and case 2
}

The usage of various languages ​​is basically similar.

If special mention is needed, in java 1.6 and below, the variable (n) can only be an integer. The String type is supported after Java 7.

In js, the String type can be used directly.

Usage examples
Copy code The code is as follows:





New Document

<script> <br>function funcSwitch(sFlag ) <br>{ <br>switch(sFlag) <br>{ <br>case "Test1": <br>alert("Test1"); <br>break; <br>case "Test2": <br> alert("Test2"); <br>break; <br>default:; <br>} <br>} <br><br>funcSwitch("Test2"); <br></script>







The logic is very simple and the code is very simple . Use string directly to distinguish.

The condition value corresponding to Case is also a variable

If the corresponding value after case is not a string, but a variable. This can be achieved in combination with RegExp.
Copy code The code is as follows:





New Document < ;/TITLE> <br><META NAME="Author" CONTENT="oscar999"> <br><script> <br>var str1 = "Test1"; <br>var str2 = "Test1"; <br>function funcSwitch(sFlag) <br>{ <br>var regExp = new RegExp(sFlag); <br>switch(true) <br>{ <br>case regExp.test(str1): <br>alert( "Test1"); <br>break; <br>case regExp.test(str2): <br>alert("Test2"); <br>break; <br>default:; <br>} <br>} <br><br>funcSwitch("Test1"); <br><br></script> <br></HEAD> <br><br><BODY> <br><br>< /BODY> <br></HTML> <br> </div> </div> </div> <div style="height: 25px;"> <div class="wzconBq" style="display: inline-flex;"> <span>Related labels:</span> <div class="wzcbqd"> <a onclick="hits_log(2,'www',this);" href-data="http://www.php.cn/search?word=switch" target="_blank">switch</a> <a onclick="hits_log(2,'www',this);" href-data="http://www.php.cn/search?word=expression" target="_blank">expression</a> </div> </div> <div style="display: inline-flex;float: right; color:#333333;">source:php.cn</div> </div> <div class="wzconOtherwz"> <a href="http://www.php.cn/faq/16113.html" title="script does not refresh the page before and after the linkage code_javascript skills"> <span>Previous article:script does not refresh the page before and after the linkage code_javascript skills</span> </a> <a href="http://www.php.cn/faq/16115.html" title="How to write css attributes using js_javascript skills"> <span>Next article:How to write css attributes using js_javascript skills</span> </a> </div> <div class="wzconShengming"> <div class="bzsmdiv">Statement of this Website</div> <div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. 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