// 在光标处插入字符串// myField    文本框对象// myValue 要插入的值function insertAtCursor(myField, myValue) {//IE supportif (document.selection) {myField.focus();sel            = document.selection.createRange();sel.text    = myValue;sel.select();}//MOZILLA/NETSCAPE supportelse if (myField.selectionStart || myField.selectionStart == '0') {var startPos    = myField.selectionStart;var endPos        = myField.selectionEnd;// save scrollTop before insertvar restoreTop    = myField.scrollTop;myField.value    = myField.value.substring(0, startPos) + myValue + myField.value.substring(endPos, myField.value.length);if (restoreTop > 0){// restore previous scrollTopmyField.scrollTop = restoreTop;}myField.focus();myField.selectionStart    = startPos + myValue.length;myField.selectionEnd    = startPos + myValue.length;} else {myField.value += myValue;myField.focus();}}function insertText() {var obj = document.getElementById("文本框");var str = "[#$%$#]插入的内容";if (document.selection) {obj.focus();var sel = document.selection.createRange();sel.text = str;} else if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') {var startPos = obj.selectionStart;var endPos = obj.selectionEnd;var tmpStr = obj.value;obj.value = tmpStr.substring(0, startPos) + str + tmpStr.substring(endPos, tmpStr.length);} else {obj.value += str;}}//Jquery光标处插入文本$(document).ready(function () {$("#btnInsert").click(function () {var obj = $("#txtquestion").get(0);var str = "[#$%$#]";if (document.selection) {obj.focus();var sel = document.selection.createRange();sel.text = str;} else if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') {var startPos = obj.selectionStart;var endPos = obj.selectionEnd;var tmpStr = obj.value;obj.value = tmpStr.substring(0, startPos) + str + tmpStr.substring(endPos, tmpStr.length);} else {obj.value += str;});});