js通过class来获取DOM对象

<!DOCTYPE html >

<html>

    <head>

        <meta charset="utf-8" />

        <title>get objects by class</title>

    </head>

    <body >

        <div class="a">1</div>

        <div class="a">2</div>

        <div class="a">3</div>

        <div class="a">4</div>

        <script>

            getObjsByClass("a");

            function  getObjsByClass (param) {

                var tags = tags || document.getElementsByTagName("*");

                var list = [];

                for( var k in tags)

                {

                    var tag = tags[k];

                    if(tag.className == param) {

                        document.write(tag.innerHTML);

                        list.push(tag);

                    }

                }

                return list;

            }

        </script>

    </body>

</html>

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