在textarea输入Tab

</p> <p>function edit<a href="https://kunjuke.com/tag/2275/" title="tab" target="_blank">tab</a>()<br /> { </p> <p> var code, sel, tmp, r<br /> var tabs=""<br /> event.returnvalue = false<br /> sel =event.srcelement.document.selection.createrange()<br /> r = event.srcelement.createtextrange() </p> <p> switch (event.keycode)<br /> {<br /> case (8) :<br /> if (!(sel.getclientrects().length > 1))<br /> {<br /> event.returnvalue = true<br /> return<br /> }<br /> code = sel.text<br /> tmp = sel.duplicate()<br /> tmp.movetopoint(r.getboundingclientrect().left, sel.getclientrects()[0].top)<br /> sel.setendpoint("starttostart", tmp)<br /> sel.text = sel.text.replace(/^\t/gm, "")<br /> code = code.replace(/^\t/gm, "").replace(/\r\n/g, "\r")<br /> r.findtext(code)<br /> r.select()<br /> break<br /> case (9) :<br /> if (sel.getclientrects().length > 1)<br /> {<br /> code = sel.text<br /> tmp = sel.duplicate()<br /> tmp.movetopoint(r.getboundingclientrect().left, sel.getclientrects()[0].top)<br /> sel.setendpoint("starttostart", tmp)<br /> sel.text = "\t"+sel.text.replace(/\r\n/g, "\r\t")<br /> code = code.replace(/\r\n/g, "\r\t")<br /> r.findtext(code)<br /> r.select()<br /> }<br /> else<br /> {<br /> sel.text = "\t"<br /> sel.select()<br /> }<br /> break<br /> case (13) :<br /> tmp = sel.duplicate()<br /> tmp.movetopoint(r.getboundingclientrect().left, sel.getclientrects()[0].top)<br /> tmp.setendpoint("endtoend", sel) </p> <p> for (var i=0; tmp.text.match(/^[\t]+/g) && i<tmp.text.match(/^[\t]+/g)[0].length; i++) tabs += "\t"<br /> sel.text = "\r\n"+tabs<br /> sel.select()<br /> break<br /> default :<br /> event.returnvalue = true<br /> break<br /> }<br /> } </p> <p><textarea rows="24" style="width:100%" name="filetext" cols="80"><br />
[ctrl+a 全选 注:如需引入外部js需刷新才能执行]