javascript - 增加图像映射点击的变量数

Question

我有一个图像映射，想跟踪它在 javascript 中被点击的次数，但我不知道如何记录点击次数。

<p>
    <img src="image.png" alt="missing" width="396" height="376" border="0" usemap="#thatPageMap" />

    <map name="imageMap" id="thatPageMap">
        <area shape="poly" coords="0,376,-3,269,50,251,60,234,71,225,76,192,69,178,44,127,50,82,73,62,94,48,69,46,108,30,145,20,162,29,162,16,183,34,193,41,228,35,247,38,225,47,242,47,279,53,306,78,324,117,326,150,335,179,327,200,327,221,351,234,357,263,393,275,394,378" href="thatpage.com" alt="Refresh" />
    </map>
</p>

上面是图像映射，下面是javascript和带有计数ID的段落。

<script type="text/javascript">

    var count;

    document.getElementById("counted").innerHTML = "This has been clicked " + count + " times.";

</script>

<p id="counted"></p>

每次单击图像映射时如何增加变量计数？

Answer 1

例如像这样:

<script type="text/javascript">
    var count = 0;
    function updateCounter( ) {
        count++;  
        document.getElementById("counted").innerHTML = "This has been clicked " + count + " times.";
    }
</script>

<p id="counted"></p>

<map name="imageMap" id="thatPageMap" onclick="updateCounter()">
    <area shape="poly" coords="0,376,-3,269,50,251,60,234,71,225,76,192,69,178,44,127,50,82,73,62,94,48,69,46,108,30,145,20,162,29,162,16,183,34,193,41,228,35,247,38,225,47,242,47,279,53,306,78,324,117,326,150,335,179,327,200,327,221,351,234,357,263,393,275,394,378" href="thatpage.com" alt="Refresh" />
</map>