使用JS在textarea在光标处插入内容

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// 在光标处插入字符串
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    // myField    文本框对象
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    // myValue 要插入的值
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    function insertAtCursor(myField, myValue)
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    {
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        //IE support
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        if (document.selection)
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        {
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            myField.focus();
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            sel            = document.selection.createRange();
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            sel.text    = myValue;
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            sel.select();
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        }
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        //MOZILLA/NETSCAPE support
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        else if (myField.selectionStart || myField.selectionStart == '0')
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        {
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            var startPos    = myField.selectionStart;
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            var endPos        = myField.selectionEnd;
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            // save scrollTop before insert
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            var restoreTop    = myField.scrollTop;
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            myField.value    = myField.value.substring(0, startPos) + myValue + myField.value.substring(endPos, myField.value.length);
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            if (restoreTop > 0)
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            {
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                // restore previous scrollTop
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                myField.scrollTop = restoreTop;
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            }
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            myField.focus();
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            myField.selectionStart    = startPos + myValue.length;
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            myField.selectionEnd    = startPos + myValue.length;
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        } else {