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我只想做一个简单的幻灯片演示，但不起作用。即使我说：

var mycars=new Array();
mycars[0] = "Saab";
mycars[1] = "Volvo";
mycars[2] = "BMW";
alert(mycars[0]);

但它不会发出警报。有人可以帮我写代码吗？什么问题

我认为问题出在数组 obj 上。请帮忙！！快！！谢谢大家！！！

<html>

<head>
<title></title>

<script language="javascript">
//start from img[0]
var imgNum = 0;
var currentImg = 0;
var img = new Array();
var canvas = document.getElementById('canv');
canvas.width = 500;//document.body.clientWidth
canvas.height = 500;//document.body.clientHeight

var context = canvas.getContext('2d');

function loadImg(){
        alert("loadimg work");
        img[imgNum] = new Image();
        img[imgNum].addEventListener('load', eventLoaded, false);
        img[imgNum].src = String(imgNum)+".jpg";    
}

loadImg();

    function eventLoaded(){
        alert("loaded");
        if(imgNum==0){      
            context.drawImage(img[0], 0, 0);
        }
        imgNum = imgNum+1;
        loadImg();
    }

function clicked(){
    alert('clicked');
    context.clearRect(0, 0, canvas.width, canvas.height);
    var displayImgNum = currentImg+1;
    context.drawImage(img[displayImgNum], 0, 0);
}
</script>
</head>


<body>
<canvas id="canv" onclick="clicked()">Your browser doesn't support HTML5.</canvas>
</body>

</html>
4

1 回答 1

1

请删除

function loadImg(){
        alert("loadimg work");
        img[imgNum] = new Image();
        img[imgNum].addEventListener('load', eventLoaded, false);
        img[imgNum].src = String(imgNum)+".jpg";    
}

loadImg();
于 2013-08-13T11:35:01.263 回答