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问题:

I wanna make image slideshow on my web, here's my code

<head>
<script type="text/javascript">
    var image1 = new Image()
    image1.src = "images/pentagg.jpg"
    var image2 = new Image()
    image2.src = "images/promo.jpg"
</script>
</head>
<body>
<p><img src="images/pentagg.jpg" width="500" height="300" name="slide" /></p>
    <script type="text/javascript">
            function slideit()
            {
                var step=1;
                document.images.slide.src = eval("image"+step+".src")
                if(step<2)
                    step++
                else
                    step=1
                setTimeout("slideit()",2500)
            }
            slideit()
    </script>
</body>

Why it's not working? I've put image I want in images folder

回答1:

Set var step=1 as global variable by putting it above the function call
put semicolons

It will look like this

<head>
<script type="text/javascript">
var image1 = new Image()
image1.src = "images/pentagg.jpg"
var image2 = new Image()
image2.src = "images/promo.jpg"
</script>
</head>
<body>
<p><img src="images/pentagg.jpg" width="500" height="300" name="slide" /></p>
<script type="text/javascript">
        var step=1;
        function slideit()
        {
            document.images.slide.src = eval("image"+step+".src");
            if(step<2)
                step++;
            else
                step=1;
            setTimeout("slideit()",2500);
        }
        slideit();
</script>
</body>