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字符串startswith_JavaScript字符串startsWith（）方法与示例
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字符串startswith_JavaScript字符串startsWith（）方法与示例
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字符串startswith
字符串startsWith()方法 (String startsWith() Method)
startsWith() method is a string method in JavaScript, it is used to check whether a string starts with a specified substring or not.
startsWith()方法是JavaScript中的字符串方法，用于檢查字符串是否以指定的子字符串開頭。
It returns true – if string starts with a specified substring, and it returns false – if string does not start with the specified substring.
它返回true -如果字符串以指定的子，它返回false -如果字符串不與指定的字符串開始。
Syntax:
句法：
String.startsWith(substring);Examples:
例子：
Input:str = "IncludeHelp is made for students.";substring = "IncludeHelp"//function callstr.startsWith(substring);Output:TrueInput:str = "IncludeHelp is made for students.";substring = "Hello"//function callstr.startsWith(substring);Output:FalseCode:
碼：
<html> <head> <title>JavaScipt Example</title> </head><body> <script>var str = "IncludeHelp is made for students.";var substring = "IncludeHelp"; if(str.startsWith(substring)){document.write(str + " starts with " + substring + "<br>");}else{document.write(str + " does not start with " + substring + "<br>");}substring = "Hello";if(str.startsWith(substring)){document.write(str + " starts with " + substring + "<br>");}else{document.write(str + " does not start with " + substring + "<br>");} </script> </body> </html>Output
輸出量
IncludeHelp is made for students. starts with IncludeHelp IncludeHelp is made for students. does not start with Hello翻譯自: https://www.includehelp.com/code-snippets/string-startsWith-method-with-example-in-javascript.aspx
字符串startswith
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