在文本框倒叙输入一文中提到了设置文本框焦点的javascript代码，今天就使用这段代码来做一个Demo。内容就是当删除单词时就一次性删除整个单词，如图所示：
下面我把示例代码贴上：
<!DOCTYPE html> <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html;charset=utf-8"> <style> .content {width: 300px;margin: 0 auto;} </style> <script src="https://cdn.staticfile.org/jquery/2.1.1-rc2/jquery.min.js"></script> </head> <body> <div> <textarea cols="30" rows="10"></textarea> </div> <script> var getCursortPosition = function(ctrl) { var CaretPos = 0; // IE Support if (document.selection) { ctrl.focus(); var Sel = document.selection.createRange(); Sel.moveStart ('character', -ctrl.value.length); CaretPos = Sel.text.length; } // Firefox support else if (ctrl.selectionStart || +ctrl.selectionStart === 0) {CaretPos = ctrl.selectionStart;} return (CaretPos); }; var selectSomeText = function(element,begin,end) { if (element.setSelectionRange) { element.setSelectionRange(begin,end); } else if (element.createTextRange) { var range = element.createTextRange(); range.moveStart("character",begin); range.moveEnd("character",end); range.select(); } }; var delWholeWord = function(text, field, pos){ var startIndex = pos; if (field.charAt(pos-1) !== ' '){ for (var i=pos-2;i>=0;i--){ if (field.charAt(i) === ' ' || i === 0){ startIndex = i; break; } } selectSomeText(text, startIndex, pos) } }; $('#demo').keydown(function(event) { if(event.keyCode !== 8) { return; } var bodyText = $(this)[0]; var bodyField = $(this).val(); var pos = getCursortPosition(bodyText); delWholeWord(bodyText, bodyField, pos); }); </script> </body> </html>