添加和删除图元(使用记号笔)

我很难添加另一个带tickers的对象。我正在尝试使用response()函数来获得eqn2(即3+2=一些输入(。您可以在response((函数中看到；"新问题"；正在正确地调用到屏幕上。这里的目标是让m=2(之前是在1(，这样drop(2)就被称为向下移动eqn2。我认为问题是，股票代码没有回到足够远的位置，无法识别obj[m].x = Math.random()*can.width而不是obj[m].y = 0.5。我不知道如何让它在这里工作，任何帮助都将不胜感激。

<html>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script type="text/javascript" src="//code.createjs.com/createjs-2013.09.25.combined.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<!----------------------------- Start Game ------------------->
<style>
#gameCanvas {
background-color: lightyellow;
}
</style>
<div class="canvasHolder1">
<div id="eqn1"> 3+3=<input type="text" id="q1j" />
</div>
<div id="eqn2"> 3+2=<input type="text" id="q2j" />
</div>
<button id="myBtn" onclick="response()">New Question</button>
<canvas id="gameCanvas" width="600" height="600">Not supported</canvas>
<script type="text/javascript">
var m=1;
function response(){
alert("New Question");
document.getElementById(`eqn${m}`).remove();
m=m+1;
stage.update();
}
const quest=[];
quest[m]= document.getElementById(`q${m}j`);
quest[m].addEventListener("keyup", function(event) {
if (event.keyCode === 13 ) {
document.getElementById("myBtn").click();
event.preventDefault();
}
});
const values = [];
values[m] = document.getElementById(`q${m}j`);
var stage = new createjs.Stage("gameCanvas");
var obj=[];
obj[m] = new createjs.DOMElement(document.getElementById(`eqn${m}`));
can = document.getElementById("gameCanvas");
obj[m].x = Math.random()*can.width;
obj[m].y = 0.5;
function startGame() {       
stage.addChild(obj[m]);
createjs.Ticker.addEventListener("tick", handleTick);
createjs.Ticker.setFPS(1);
function handleTick(event){
drop(m);
stage.update();
}
}
function drop(i){
obj[i].x += 1;
obj[i].y +=3;
}
</script>
<body onload="startGame();">
<div >
<canvas>This browser or document mode doesn't support canvas object.</canvas>
</div>
</body>
</html>

这不是一个真正的股票行情问题。您必须在响应函数中重新定义需要的变量，然后再使用ticker。

<html>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script type="text/javascript" src="//code.createjs.com/createjs-2013.09.25.combined.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<!----------------------------- Start Game ------------------->
<style>
#gameCanvas {
background-color: lightyellow;
}
</style>
<div class="canvasHolder1">
<div id="eqn1"> 3+3=<input type="text" id="q1j" />
</div>
<div id="eqn2"> 3+2=<input type="text" id="q2j" />
</div>
<div id="eqn3"> 5+2=<input type="text" id="q3j" />
</div>
<canvas id="gameCanvas" width="600" height="600">Not supported</canvas>
<script type="text/javascript">
var m=1;
var quest=[];
quest[m]= document.getElementById(`q${m}j`);
var values = [];
var stage = new createjs.Stage("gameCanvas");
var obj=[];
can = document.getElementById("gameCanvas");
function response(){
alert("New Question");
document.getElementById(`eqn${m}`).remove();
m=m+1;

quest[m] = document.getElementById(`q${m}j`);
quest[m].addEventListener("keyup", enterFunction);
values[m] = document.getElementById(`q${m}j`);
obj[m] = new createjs.DOMElement(document.getElementById(`eqn${m}`));
obj[m].x = Math.random()*can.width;
obj[m].y = 0.5;
stage.addChild(obj[m]);
}
function startGame() {  
quest[m].addEventListener("keyup", enterFunction);
values[m] = document.getElementById(`q${m}j`);
obj[m] = new createjs.DOMElement(document.getElementById(`eqn${m}`));
obj[m].x = Math.random()*can.width;
obj[m].y = 0.5;
stage.addChild(obj[m]);
createjs.Ticker.addEventListener("tick", handleTick);
createjs.Ticker.setFPS(2);
function handleTick(event){
drop(m);
stage.update();
}
}
function drop(i){
obj[i].x += 1;
obj[i].y +=3;
}
function enterFunction(){
if (event.keyCode === 13 ) {
document.getElementById("myBtn").click();
}
}
</script>
<body onload="startGame();">
<div >
<canvas>This browser or document mode doesn't support canvas object.</canvas>
</div>
</body>
<button id="myBtn" onclick="response()">New Question</button>
</html>

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