1 (function($) { 2 $.fn.extend({ 3 insertAtCaret: function(myValue) { 4 var $t = $(this)[0]; 5 //IE 6 if (document.selection) { 7 this.focus(); 8 sel = document.selection.createRange(); 9 sel.text = myValue; 10 this.focus(); 11 } else 12 //!IE 13 if ($t.selectionStart || $t.selectionStart == "0") { 14 var startPos = $t.selectionStart; 15 var endPos = $t.selectionEnd; 16 var scrollTop = $t.scrollTop; 17 $t.value = $t.value.substring(0, startPos) + myValue + $t.value.substring(endPos, $t.value.length); 18 this.focus(); 19 $t.selectionStart = startPos + myValue.length; 20 $t.selectionEnd = startPos + myValue.length; 21 $t.scrollTop = scrollTop; 22 } else { 23 this.value += myValue; 24 this.focus(); 25 } 26 } 27 }) 28 })(jQuery);
IE下可以通过document.selection.createRange();来实现，而Firefox（火狐）浏览器则需要首先获取光标位置，然后对value进行字符串截取处理。
$(selector).insertAtCaret("value");