javascript对象之 selectionStart selectionEnd

<script>

    function inserttag(){

        var text=document.getElementById('con');

        text.focus();

        var start=text.selectionStart;

        var end = text.selectionEnd;

        var ss = text.value.substring(start, end);

        alert(ss);

        //alert(start);

    }

</script>

<form action="" method="post">

    <textarea name="text" id="con" cols="30"  rows="10">The text selection appears here</textarea>

    <input type="submit" onclick="inserttag()" name="sub" value="OK">

</form>

用鼠标选取一块效果图：

javascript对象之 selectionStart selectionEnd-LMLPHP

<html>

<head>

<title>Selection Start and End example</title>

    <script type="text/javascript">

        function SelectSomeText () {

            var input = document.getElementById ("Textbox");

                input.selectionStart = 4;

                input.selectionEnd = 13;

        }

    </script>

</head>

<body>

    <p><input type="text" id="Textbox" size="40" value="The text selection appears here"/></p>

    <p><button onclick="SelectSomeText ()">See selection</button></p>

</body>

</html>

效果图：

javascript对象之 selectionStart selectionEnd-LMLPHP