使用JS在textarea在光标处插入内容(2)

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            myField.value += myValue;
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            myField.focus();
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        }
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    }
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       function insertText() {
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            var obj = document.getElementById("文本框");
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            var str = "[#$%$#]插入的内容";
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               if (document.selection) {
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                   obj.focus();
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                   var sel = document.selection.createRange();
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                   sel.text = str;
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               } else if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') {
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                   var startPos = obj.selectionStart;
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                   var endPos = obj.selectionEnd;
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                    var tmpStr = obj.value;
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                    obj.value = tmpStr.substring(0, startPos) + str + tmpStr.substring(endPos, tmpStr.length);
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                } else {
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                    obj.value += str;
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            }
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        }
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//Jquery光标处插入文本
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        $(document).ready(function () {
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            $("#btnInsert").click(function () {
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                var obj = $("#txtquestion").get(0);