charCodeAt

取字串中一個字元的編碼

<script>var TxT = "0123456789ABCDEF"</script> <h3>charCodeAt() 取字串中一個字元的編碼</h3> <pre>stringObject.charCodeAt(index) index : 索引指標從 0 算起、如果參數 index 不在 0 與字串長度之間， 將返回一個空字串的十進位的 ASCII 編碼。 var TxT = "0123456789ABCDEF" TxT.charCodeAt(0) = <script>document.write(TxT.charCodeAt(0)) </script> TxT.charCodeAt(4) = <script>document.write(TxT.charCodeAt(4)) </script> TxT.charCodeAt(12) = <script>document.write(TxT.charCodeAt(12)) </script> "k".charCodeAt(0) = <script>document.write("k".charCodeAt(0)) </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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<input type="text" id="Dd" value="push key" size="4" readonly style="font-size: 20px ;"> <div id="TTkey" style="font-size: 20px ;" ></div> <script> window.addEventListener("keydown", keyDownTextField); function keyDownTextField(e) { var KeyC =""; KeyC += "event.code = " + event.code + "<br >"; KeyC += "event.key = " + event.key + "<br >"; KeyC += "event.keyCode = " + event.keyCode + "<br >"; KeyC += "event.charCode = " + event.charCode + "<br >"; KeyC += "event.location = " + event.location + "<br >"; KeyC += "event.which = " + event.which + "<br ><br>"; KeyC += "event.metaKey= " + event.metaKey + "<br >"; KeyC += "event.altKey = " + event.altKey + "<br >"; KeyC += "event.ctrlKey = " + event.ctrlKey + "<br >"; KeyC += "event.shiftKey = " + event.shiftKey + "<br >"; document.getElementById('TTkey').innerHTML = KeyC ; event.keyCode=9;window.event.keyCode=9; event.returnValue=false; } document.getElementById('Dd').select(); </script> <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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#html #網頁格式 #style #div #replace() 字串取代 #match() 傳回尋找到的字串 #concat() 混合兩個字串成一個新字串 #charCodeAt() 取字串中一個字的編碼 #split() 分隔成字串陣列