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  • JavaScript学习历程03

    一闪一闪亮晶晶

    <script type="text/javascript">
            var nn = Number(prompt('请输入一个1-9的正整数!'));
            var n =nn;
            var num=n;
            var star="*";
            // document.write(num01);
            for (var i = 0; i < n; i++) {
                
                for (var j = 0; j < num; j++) {
                    document.write(star)
                    
                }
                --num;
                document.write(n);
                document.write("<br />");
            }
            n =nn;
            for (var i = 1; i < n; i++) {
                
                for (var j = 0; j < i+1; j++) {
                    document.write(star)
                    
                }
                document.write(n);
                document.write("<br />");
            }
    
        </script>

    window对 图片自动切换 要求:使用延时器和定时器来制作。

    <script type="text/javascript">
        var i=0;
        window.onload=function()
        {
            window.setInterval(Getimg,100);
        }
        function Getimg()
        {
            ++i
            var imgObj=document.getElementById("imgId");
            imgObj.src="images/dd_scroll_"+i+".jpg";
            if (i==6) 
            {
                i=0;
            }
        }
        </script>
    </head>
    <body>
    <img id="imgId" src="" />    
    </body>

    点出满天小星星

    <script type="text/javascript">
        function start2(e)
        {
            var x=e.clientX;
            // document.write(x);
            var y=e.clientY;
            // document.write(y);
    
            // 创建节点
            var imgObj=document.createElement("img");
            // 挂载节点 
            document.body.appendChild(imgObj);
         
            imgObj.src="1.png";
            imgObj.width=getRandom(20,50);
            imgObj.style.position = "absolute";
            imgObj.style.left = x-imgObj.width/2 + "px";
            imgObj.style.top = y-imgObj.width/2 + "px";
    
            
            // imgObj.style.left=
        }
        function getRandom(min,max)
        {
            var random=Math.random()*(max-min)+min;
            return random;
        }
    
            
        </script>
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  • 原文地址:https://www.cnblogs.com/testsec/p/6218200.html
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