react-examples/professional_javascript_for_web/ch12/DOMRangeExample9.htm at master · zhangjunhd/react-examples · GitHub

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<!DOCTYPE html>
<html>
    <head>
        <title>DOM Range Example</title>
        <script type="text/javascript">
            function compare() {
                var range1 = document.createRange(),
                    range2 = document.createRange(),
                    p1 = document.getElementById("p1");

                range1.selectNodeContents(p1);
                range2.selectNodeContents(p1);
                range2.setEndBefore(p1.lastChild);

                alert(range1.compareBoundaryPoints(Range.START_TO_START, range2));  //outputs 0
                alert(range1.compareBoundaryPoints(Range.END_TO_END, range2));      //outputs 1
            }
        </script>
    </head>
    <body><p id="p1"><b>Hello</b> World</p>
        <input type="button" value="Compare Ranges" onclick="compare()" />
        <p><strong>Note:</strong> This example uses DOM ranges and will only work in browsers that support DOM ranges. This example will fail in Internet Explorer &lt; 9.</p>

    </body>
</html>