string character position

String meta position 字串元位置,

<script>var TxT = "0123456789ABCDEF"</script> <h3>indexOf() 字串尋找</h3> <pre>stringObject.indexOf(searchvalue,fromIndex) 字串尋找「由左至右尋找」將從頭到尾地檢索字串 stringObject， 是否包含有 searchvalue。 檢索開始的位置 fromIndex (沒有指定 fromIndex 時)。 如果找到一個 searchvalue ，轉回 searchvalue 所得位置。 "0123456789ABCDEF".indexOf("456") = <script>document.write( "0123456789ABCDEF".indexOf("456")) </script> "0123456789ABCDEF".indexOf("456",2) = <script>document.write( "0123456789ABCDEF".indexOf("456",2)) </script> "0123456789ABCDEF".indexOf("456",8) = <script>document.write( "0123456789ABCDEF".indexOf("456",8)) </script> "0123456789ABCDEF".indexOf("AB") = <script>document.write( "0123456789ABCDEF".indexOf("AB")) </script> "0123456789ABCDEF".indexOf("939") = <script>document.write( "0123456789ABCDEF".indexOf("939")) </script> </pre> <style> h3 {text-align: center; font-size: 30px; font-weight: bold; text-shadow: 10px 6px 10px grey; color: blue; } pre {font-size: 20px;} ol {background-color:tan ;} li {background-color:ivory ;padding-left:10px;text-align: left;} li {word-break: break-word } r { color:red} </style>

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<script>var TxT = "0123456789ABCDEF"</script> <h3>lastIndexOf() 字串反向尋找</h3> <pre>stringObject.lastIndexOf(searchvalue,fromIndex) 字串反向尋找「由右至左尋找」(反向)將從尾到頭地檢索字串， stringObject 看它是否含有子串 searchvalue。 開始檢索的位置(左)在字串的 fromIndex 處或沒有指定則為字串的結尾。 var TxT = "0123456789ABCDEF" TxT.lastIndexOf("456",15) = <script>document.write( TxT.lastIndexOf("456",15)) </script> TxT.lastIndexOf("456",2) = <script>document.write( TxT.lastIndexOf("456",2)) </script> TxT.lastIndexOf("456",8) = <script>document.write( TxT.lastIndexOf("456",8)) </script> TxT.lastIndexOf("AB") = <script>document.write( TxT.lastIndexOf("AB")) </script> TxT.lastIndexOf("939") = <script>document.write( TxT.lastIndexOf("939")) </script> </pre> <style> h3 {text-align: center; font-size: 30px; font-weight: bold; text-shadow: 10px 6px 10px grey; color: blue; } pre {font-size: 20px;} ol {background-color:tan ;} li {background-color:ivory ;padding-left:10px;text-align: left;} li {word-break: break-word } r { color:red} </style>

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<script>var TxT = "0123456789ABCDEF"</script> <h3>search() 傳回尋找到的字串位置</h3> <pre>stringObject.search(regexp) 傳回尋找到的「字串位置」regexp 為待尋找的字串， 可加 /g 代表總體尋找，可加 /i 代表不分大小寫。 "As As as As".search("as") = <script>document.write( "As As as As".search("as") ) </script> "As As as As".search(/as/) = <script>document.write( "As As as As".search(/as/) ) </script> "As As as As".search("As") = <script>document.write( "As As as As".search("As") ) </script> "As As as As".search(/As/g) = <script>document.write( "As As as As".search(/As/g) ) </script> "As As as As".search(/As/gi) = <script>document.write( "As As as As".search(/As/gi) ) </script> </pre> <style> h3 {text-align: center; font-size: 30px; font-weight: bold; text-shadow: 10px 6px 10px grey; color: blue; } pre {font-size: 20px;} ol {background-color:tan ;} li {background-color:ivory ;padding-left:10px;text-align: left;} li {word-break: break-word } r { color:red} </style>

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<script>var TxT = "0123456789ABCDEF"</script> <h3>startsWith() 判斷字符串是否以指定的子字符串開始</h3> <pre> string.startsWith(searchvalue, start) 方法用於 檢測 searchvalue 是否是指定的子串開始。 searchvalue : 要查找的字符串 start : 查找的開始位置，默認為 0。 "hi Hello World".startsWith("hi") = <script>document.write( "hi Hello World".startsWith("hi") ) </script> "hi Hello World".startsWith("Hello") = <script>document.write( "hi Hello World".startsWith("Hello") ) </script> "hi Hello World".startsWith("World") = <script>document.write( "hi Hello World".startsWith("World") ) </script> "hi Hello World".startsWith("World",9) = <script>document.write( "hi Hello World".startsWith("World",9) ) </script> </pre> <style> h3 {text-align: center; font-size: 30px; font-weight: bold; text-shadow: 10px 6px 10px grey; color: blue; } pre {font-size: 20px;} ol {background-color:tan ;} li {background-color:ivory ;padding-left:10px;text-align: left;} li {word-break: break-word } r { color:red} </style>

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<script>var TxT = "0123456789ABCDEF"</script> <h3>endsWith() 判斷字符串是否以指定的子字符串結尾</h3> <pre> stringObject.endsWith(searchvalue, start) 方法用於 檢測 searchvalue 是否是指定的子串結尾。 searchvalue : 要查找的字符串 start : 查找的開始位置，默認為 0。 "hi Hello World".endsWith("hi") = <script>document.write( "hi Hello World".endsWith("hi") ) </script> "hi Hello World".endsWith("Hello") = <script>document.write( "hi Hello World".endsWith("Hello") ) </script> "hi Hello World".endsWith("World") = <script>document.write( "hi Hello World".endsWith("World") ) </script> "hi Hello World".endsWith("Hello",11) = <script>document.write( "hi Hello World".endsWith("Hello",11) ) </script> </pre> <style> h3 {text-align: center; font-size: 30px; font-weight: bold; text-shadow: 10px 6px 10px grey; color: blue; } pre {font-size: 20px;} ol {background-color:tan ;} li {background-color:ivory ;padding-left:10px;text-align: left;} li {word-break: break-word } r { color:red} </style>

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<script>var TxT = "0123456789ABCDEF"</script> <h3>test() 方法用於檢測一個字符串是否匹配某個模式</h3> <pre> RegExpObject.test(string) RegExpObject : 字符串是否全在。 string : 要檢測的字符串。 /hi/.test('hi Hello World') = <script>document.write( /hi/.test('hi Hello World') ) </script> /Hello/.test('hi Hello World') = <script>document.write( /Hello/.test('hi Hello World') ) </script> /World/.test('hi Hello World') = <script>document.write( /World/.test('hi Hello World') ) </script> /love/.test('hi Hello World') = <script>document.write( /love/.test('hi Hello World') ) </script> /r/.test('hi Hello World') = <script>document.write( /r/.test('hi Hello World') ) </script> /R/.test('hi Hello World') = <script>document.write( /R/.test('hi Hello World') ) </script> </pre> <style> h3 {text-align: center; font-size: 30px; font-weight: bold; text-shadow: 10px 6px 10px grey; color: blue; } pre {font-size: 20px;} ol {background-color:tan ;} li {background-color:ivory ;padding-left:10px;text-align: left;} li {word-break: break-word } r { color:red} </style>

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