我想在我的div中添加onload ='startGame（）'
[英]I want to add onload='startGame()' in my div
問題描述
我想在div而不是body上添加此功能
<body onload="startGame()"> = Wrong
喜歡
<div id="gmdemo" onload="startGame()"> = Right
當我在div上添加此功能時，代碼未運行
<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"/> <style> canvas { border:1px solid #d3d3d3; background-color: #f1f1f1; } </style> </head> <body onload="startGame()"> <script> var myGamePiece; var myObstacles = []; var myScore; function startGame() { myGamePiece = new component(20, 20, "red", 10, 120); myGamePiece.gravity = 0.05; myScore = new component("30px", "Consolas", "black", 280, 40, "text"); myGameArea.start(); } var myGameArea = { canvas : document.createElement("canvas"), start : function() { this.canvas.width = 480; this.canvas.height = 270; this.context = this.canvas.getContext("2d"); document.body.insertBefore(this.canvas, document.body.childNodes[0]); this.frameNo = 0; this.interval = setInterval(updateGameArea, 20); }, clear : function() { this.context.clearRect(0, 0, this.canvas.width, this.canvas.height); } } function component(width, height, color, x, y, type) { this.type = type; this.score = 0; this.width = width; this.height = height; this.speedX = 0; this.speedY = 0; this.x = x; this.y = y; this.gravity = 0; this.gravitySpeed = 0; this.update = function() { ctx = myGameArea.context; if (this.type == "text") { ctx.font = this.width + " " + this.height; ctx.fillStyle = color; ctx.fillText(this.text, this.x, this.y); } else { ctx.fillStyle = color; ctx.fillRect(this.x, this.y, this.width, this.height); } } this.newPos = function() { this.gravitySpeed += this.gravity; this.x += this.speedX; this.y += this.speedY + this.gravitySpeed; this.hitBottom(); } this.hitBottom = function() { var rockbottom = myGameArea.canvas.height - this.height; if (this.y > rockbottom) { this.y = rockbottom; this.gravitySpeed = 0; } } this.crashWith = function(otherobj) { var myleft = this.x; var myright = this.x + (this.width); var mytop = this.y; var mybottom = this.y + (this.height); var otherleft = otherobj.x; var otherright = otherobj.x + (otherobj.width); var othertop = otherobj.y; var otherbottom = otherobj.y + (otherobj.height); var crash = true; if ((mybottom < othertop) || (mytop > otherbottom) || (myright < otherleft) || (myleft > otherright)) { crash = false; } return crash; } } function updateGameArea() { var x, height, gap, minHeight, maxHeight, minGap, maxGap; for (i = 0; i < myObstacles.length; i += 1) { if (myGamePiece.crashWith(myObstacles[i])) { return; } } myGameArea.clear(); myGameArea.frameNo += 1; if (myGameArea.frameNo == 1 || everyinterval(150)) { x = myGameArea.canvas.width; minHeight = 20; maxHeight = 200; height = Math.floor(Math.random()*(maxHeight-minHeight+1)+minHeight); minGap = 50; maxGap = 200; gap = Math.floor(Math.random()*(maxGap-minGap+1)+minGap); myObstacles.push(new component(10, height, "green", x, 0)); myObstacles.push(new component(10, x - height - gap, "green", x, height + gap)); } for (i = 5; i < myObstacles.length; i += 1) { myObstacles[i].x += -1; myObstacles[i].update(); } myScore.text="SCORE: " + myGameArea.frameNo; myScore.update(); myGamePiece.newPos(); myGamePiece.update(); } function everyinterval(n) { if ((myGameArea.frameNo / n) % 1 == 0) {return true;} return false; } function accelerate(n) { myGamePiece.gravity = n; } </script> <br> <button onmousedown="accelerate(-0.2)" onmouseup="accelerate(0.05)">ACCELERATE</button> <p>Use the ACCELERATE button to stay in the air</p> <p>How long can you stay alive?</p> </body> </html>
4 個解決方案
解決方案1
1 2017-10-13 12:25:14
div或大多數DOM元素沒有加載（有些例外）。 請看看這個舊帖子： window.onload vs <body onload =“” />
解決方案2
1 2017-10-13 12:27:02
您不能在div上添加onload。 您可以做的是將函數調用直接放在元素之后
...
<div id="gmdemo">Some content</div>
<script type="text/javascript">
startGame();
</script>
...
解決方案3
1 已采納 2017-10-27 06:00:09
您不必將onload添加到div中。
<div id="gmdemo">Some content</div>
<script type="text/javascript">
startGame('gmdemo');
</script>
解決方案4
0 2017-10-13 12:24:54
如此處所述： 如何將onload事件添加到div元素？
您不能將onload事件添加到div上。 但是，您可以將對函數的調用直接放入div中，如鏈接的問題所示。
如何在我的Dojo類中添加“onload”？
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