javascript鍵盤事件全面控制腳本代碼

2019-11-21 01:43:48

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<STYLE TYPE="text/css"> TD {text-align:center} </STYLE> <SCRIPT LANGUAGE="JavaScript"> function init() {     document.onkeydown = showKeyDown     document.onkeyup = showKeyUp     document.onkeypress = showKeyPress } function showKeyDown(evt) {     evt = (evt) ? evt : window.event     document.getElementById("pressKeyCode").innerHTML = 0     document.getElementById("upKeyCode").innerHTML = 0     document.getElementById("pressCharCode").innerHTML = 0     document.getElementById("upCharCode").innerHTML = 0     restoreModifiers("")     restoreModifiers("Down")     restoreModifiers("Up")     document.getElementById("downKeyCode").innerHTML = evt.keyCode     if (evt.charCode) {         document.getElementById("downCharCode").innerHTML = evt.charCode     }     showModifiers("Down", evt) } function showKeyUp(evt) {     evt = (evt) ? evt : window.event     document.getElementById("upKeyCode").innerHTML = evt.keyCode     if (evt.charCode) {         document.getElementById("upCharCode").innerHTML = evt.charCode     }     showModifiers("Up", evt)     return false } function showKeyPress(evt) {     evt = (evt) ? evt : window.event     document.getElementById("pressKeyCode").innerHTML = evt.keyCode     if (evt.charCode) {         document.getElementById("pressCharCode").innerHTML = evt.charCode     }     showModifiers("", evt)     return false } function showModifiers(ext, evt) {     restoreModifiers(ext)     if (evt.shiftKey) {         document.getElementById("shift" + ext).style.backgroundColor = "#ff0000"     }     if (evt.ctrlKey) {         document.getElementById("ctrl" + ext).style.backgroundColor = "#00ff00"     }     if (evt.altKey) {         document.getElementById("alt" + ext).style.backgroundColor = "#0000ff"     } } function restoreModifiers(ext) {     document.getElementById("shift" + ext).style.backgroundColor = "#ffffff"     document.getElementById("ctrl" + ext).style.backgroundColor = "#ffffff"     document.getElementById("alt" + ext).style.backgroundColor = "#ffffff" } </SCRIPT> </HEAD> <BODY onLoad="init()"> <H1>Keyboard Event Handler Lab</H1> <HR> <FORM> <TABLE BORDER=2 CELLPADDING=2> <TR><TH></TH><TH>onKeyDown</TH><TH>onKeyPress</TH><TH>onKeyUp</TH></TR> <TR><TH>Key Codes</TH>     <TD ID="downKeyCode">0</TD>     <TD ID="pressKeyCode">0</TD>     <TD ID="upKeyCode">0</TD> </TR> <TR><TH>Char Codes (IE5/Mac; NN6)</TH>     <TD ID="downCharCode">0</TD>     <TD ID="pressCharCode">0</TD>     <TD ID="upCharCode">0</TD> </TR> <TR><TH ROWSPAN=3>Modifier Keys</TH>     <TD><SPAN ID="shiftDown">Shift</SPAN></TD>     <TD><SPAN ID="shift">Shift</SPAN></TD>     <TD><SPAN ID="shiftUp">Shift</SPAN></TD> </TR> <TR>     <TD><SPAN ID="ctrlDown">Ctrl</SPAN></TD>     <TD><SPAN ID="ctrl">Ctrl</SPAN></TD>     <TD><SPAN ID="ctrlUp">Ctrl</SPAN></TD> </TR> <TR>     <TD><SPAN ID="altDown">Alt</SPAN></TD>     <TD><SPAN ID="alt">Alt</SPAN></TD>     <TD><SPAN ID="altUp">Alt</SPAN></TD> </TR> </TABLE> </FORM>

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