Question

我目前正在使用Javascript创建一个项目，旨在成为一种反应游戏＆＃34;。按下＆＃34;开始＆＃34;按钮，根据一些辅助方法决定的颜色，大小，位置（边距）和形状（方框或圆形），屏幕上会弹出一个形状。目标是尽快点击形状，然后页面将打印所用的时间。然后会显示一个新形状并重复循环。

然而，一旦我按下＆＃34;开始＆＃34>按钮，屏幕上没有任何内容。形状无处可见。

任何人都可以帮助让形状出现吗？我认为它与样式表有关，但我不太确定。

<html>

<head>

    <title>Reaction Tester</title>

</head>

<body>

    <h1>Test Your Reactions!</h1>

    <p>Click on the boxes and circles as quickly as you can!</p>

    <h2 id="recorded-time"></h2>

    <button id="start-button">Begin!</button>

    <div id="current-shape"></div>

    <script type="text/javascript">

        var beginTime = 0.0; //default value

        document.getElementById("start-button").onclick = function() {
            document.getElementById("start-button").style.display = "none";
            newShape();     
        }

        function decideShape() { //chooses between a circle or box(square)
            var x = Math.random();
            if(x < 0.5) {
                return("circle");
            } else {
                return("box");
            }
        }

        function decideColor() { //chooses between a list of 8 colors
            var x = Math.random();
            if(x < 0.125) {
                return("red");
            } else if(x < 0.25) {
                return("blue");
            } else if(x < 0.375) {
                return("yellow");
            } else if(x < 0.5) {
                return("green");
            } else if(x < 0.625) {
                return("purple");
            } else if(x < 0.75) {
                return("black");
            } else if(x < 0.875) {
                return("gray");
            } else {
                return("#00FFFF"); //cyan
            }
        }

        function decideSize() { //self explanatory
            var value; //circle - radius, box - half of side length

            value = Math.floor(Math.random() * 75) + 25; //diameter/side length set to be between 50 and 199

            return value;
        }

        function decideMargin(size) { //depends on size of shape
            var value;
            value = Math.floor(Math.random()*(400 - size)) + size;
            return value;
        }

        document.getElementById("current-shape").onclick = function() {
            newShape();
        }

        function beginTimer() {
            var bT = new Date();
            beginTime = bT;
        }

        function stopTimer() {
            var endTime = new Date();
            var elapsedTime = endTime - beginTime;
            document.getElementById("recorded-time").innerHTML = "Your time: " + (elapsedTime/1000.0) + " seconds";
        }

        function newShape() {
            if(beginTime != 0.0) {
                stopTimer();
            }

            var nextShape = decideShape();
            var nextColor = decideColor();
            var nextSize = decideSize();
            var nextLeftMargin = decideMargin(nextSize);
            var nextTopMargin = decideMargin(nextSize);

            document.getElementById("current-shape").style.backgroundColor = nextColor;
            document.getElementById("current-shape").style.marginLeft = nextLeftMargin;
            document.getElementById("current-shape").style.marginTop = nextTopMargin;

            if(nextShape = "circle") {
                document.getElementById("current-shape").style.borderRadius = 50;
            } else { //nextShape = "box"
                document.getElementById("current-shape").style.borderRadius = 0;
            }

            beginTimer();

        }

    </script>

</body>

</html>

Answer 1

您需要为“current-shape”div添加宽度和高度。

 <div id="current-shape" style="width:100px;height:100px"></div>

你还需要在函数newShape中为nextShape和nextColor添加引号：

  var nextShape = "circle";
  var nextColor = "red";

无法显示形状

1 个答案: