JavaScript String search()用法及代碼示例

字符串 search() 方法

search() is method 是一個 String 方法，用於檢查給定字符串中是否存在子字符串。它從子字符串所在的字符串返回子字符串的起始索引。如果字符串中不存在子字符串 – 則返回 -1。

用法:

    String.search(substring);

這裏，substring是要搜索的字符串的一部分。

例：

<html>
<head>
<title>JavaScipt Example</title>
</head>

<body>
<script>		
    var str = "friends say Hello";
    
    var substr = "Hello";		
    var index = str.search(substr);
    if(index!=-1)
        document.write(substr + " found at " + index + " position.<br>");
    else
        document.write(substr + " does not exist in the " + str + ".<br>");

    substr = "Hi";
    index = str.search(substr);		
    if(index!=-1)
        document.write(substr + " found at " + index + " position.<br>");
    else
        document.write(substr + " does not exist in the " + str + ".<br>");	
</script>
</body>
</html>

輸出

Hello found at 12 position.
Hi does not exist in the friends say Hello.

相關用法

注：本文由純淨天空篩選整理自 String search() Method with Example in JavaScript。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。