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我正在使用HTML5，並且想知道鼠標移動過程中是否按住鼠標右鍵或鼠標左鍵。鼠標右鍵有event.button = 2的右鍵。左邊的按鈕有event.button = 0。在mousemove期間，event.button = 0始終。我提供了一些示例代碼。我究竟做錯了什麼？我想在鼠標移動事件中檢測鼠標右鍵或鼠標鍵是否關閉
<!DOCTYPE html>
<html lang="en">
<head>
<title>demo on detecting mouse buttons</title>
<meta charset="utf-8"/>
<style>
#mycanvas{ border-style:solid; width:400px; height:400px; border-width:2px;}
</style>
<script type="text/javascript">
function detectDown(event)
{
var string = "Mouse Down, event.button = " +event.button;
var canvas = document.getElementById("mycanvas");
var context = canvas.getContext("2d");
context.clearRect(0,0,300,20);
context.fillText(string,0,10);
}
function detectMove(event)
{
var string = "Mouse Move, event.button = " +event.button;
var canvas = document.getElementById("mycanvas");
var context = canvas.getContext("2d");
context.clearRect(0,30,300,20);
context.fillText(string,0,40);
}
function detectUp(event)
{
var string = "Mouse Up, event.button = " +event.button;
var canvas = document.getElementById("mycanvas");
var context = canvas.getContext("2d");
context.clearRect(0,60,300,20);
context.fillText(string,0,70);
}
</script>
</head>
<!-- -->
<body>
<canvas id="mycanvas"onmousedown="detectDown(event)" onmouseup="detectUp(event)" onmousemove="detectMove(event)" >
</canvas>
</body>
</html>
您可能會發現jsfiddle.com適用於這些測試和演示。 –