我正在创建电梯的一个程序,其中包括电梯内的向上,向下按钮(外部功能(和按钮(0到5::内部功能(,我的外部功能工作正常,但是当电梯内部用户按下任何按钮时,电梯应该转到那个地方。 并更新用户和电梯的位置。但是当我按下按钮(0,1,2,3,4,5(时它不起作用。谁能帮我解决问题。提前谢谢。
code::
<!DOCTYPE html>
<html lang="en">
<head>
<title>elevator</title>
</head>
<body>
<h2>Internal Functions</h2>
<span>current user position :: </span>
<p id="userPosition"></p>
<span>current elevator position :: </span>
<p id="elevatorPostion"></p>
<button id="btn" onclick="inFunction(0)" value="0">0</button>
<button id="btn" onclick="inFunction(1)" value="1">1</button>
<button id="btn" onclick="inFunction(2)" value="2">2</button>
<button id="btn" onclick="inFunction(3)" value="3">3</button>
<button id="btn" onclick="inFunction(4)" value="4">4</button>
<button id="btn" onclick="inFunction(5)" value="5">5</button>
<h2>External Functions</h2>
user position:
<input type="text" id="userText" name="UserPosition" value="0">
<button onclick="exFunction('up')">UP</button>
<button onclick="exFunction('down')">DOWN</button>
<script>
var userPosition = 0,
elevatorPosition = 4
function exFunction(pressedValue) {
console.log(pressedValue);
var userPosition = document.getElementById("userText").value;
document.getElementById("userPosition").innerHTML = userPosition;
document.getElementById("elevatorPostion").innerHTML = elevatorPosition;
var intervalEle = setInterval(function () {
if (userPosition > elevatorPosition) {
console.log('Elevator position', elevatorPosition);
elevatorPosition++;
} else if (userPosition < elevatorPosition) {
elevatorPosition--;
} else {
elevatorPosition == userPosition;
clearInterval(intervalEle);
}
document.getElementById("userPosition").innerHTML = userPosition;
document.getElementById("elevatorPostion").innerHTML = elevatorPosition;
}, 1000);
}
function inFunction(clickedValue) {
var btnValue = document.querySelector('btn').value;
document.getElementById("userPosition").innerHTML = userPosition;
document.getElementById("elevatorPostion").innerHTML = elevatorPosition;
console.log(btnValue);
var intervalEle2 = setInterval(function () {
if (elevatorPosition > btnValue) {
elevatorPosition--
} else if (elevatorPosition < btnValue) {
elevatorPosition++
} else {
elevatorPosition == btnValue;
clearInterval(intervalEle2)
}
document.getElementById("userPosition").innerHTML = userPosition;
document.getElementById("elevatorPostion").innerHTML = elevatorPosition;
}, 1000)
}
</script>
</body>
</html>
输出: https://i.stack.imgur.com/tKeeL.png
var btnValue = document.querySelector('btn').value;
您的页面上没有<btn>
元素,因此document.querySelector('btn')
返回null
。您非法重复使用"btn"
作为 ID,因此document.getElementById('btn')
也不会按照您的期望行事。
您已经获得了单击的按钮的编号;您将其作为clickedValue
传递给inFunction
。就用它。