如果我有多对对象，例如（A1，A2），（B1，B2），（C1，C2），我想要的是当对象A1 / B1 / C1移动时，对象A2 / B2 / C2为以及移动。当我多选对象（例如A1和B1）并四处移动时，A2和B2根本不会移动，因为单个对象事件不会触发。我该如何解决？
谢谢！
这是一支演示笔：https : //codepen.io/taineleau/pen/PdxRKX
<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>Fabric JS playground</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/fabric.js/2.0.0-rc.3/fabric.js'></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
<style>
canvas {
position:relative;
display:inline-block;
width:100%;
}
</style>
</head>
<body>
<canvas id="fabriccanvas" width="1000px" height="1000px"></canvas>
<script>
function bind(obj1, obj2) {
obj1.on("moving", function () {
obj2.left = this.left + 50;
obj2.top = this.top;
});
}
var canvas = new fabric.Canvas("fabriccanvas");
var A1 = new fabric.Rect({
width: 200, height: 100, left: 0, top: 50, angle: 30,
fill: 'rgb(255,0,0)'
});
var A2 = new fabric.Rect({
width: 200, height: 100, left: 50, top: 50, angle: 30,
fill: 'rgba(255,0,0,0.5)',
selectable: false,
});
var B1 = new fabric.Rect({
width: 100, height: 100, left: 35, top: 25, angle: -10,
fill: 'rgb(0,200,0)'
});
var B2 = new fabric.Rect({
width: 100, height: 100, left: 85, top: 25, angle: -10,
fill: 'rgba(0,200,0,0.5)',
selectable: false,
});
bind(A1, A2);
bind(B1, B2);
canvas.add(A1, A2, B1, B2);
</script>
</body>
</html>您可以使用on.("object:moving")，检查它是否与您要绑定的对象匹配，或者包含一个对象，然后进行适当更新。如果它包含要绑定的对象，则必须通过容器本身的位置和大小来使其偏移。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Fabric JS playground</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/fabric.js/2.0.0-rc.3/fabric.js'></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
<style>
canvas {
position: relative;
display: inline-block;
width: 100%;
}
</style>
</head>
<body>
<canvas id="fabriccanvas" width="1000px" height="1000px"></canvas>
<script>
function bind(obj1, obj2) {
canvas.on('object:moving', function(event) {
if (obj1 == event.target) {
obj2.left = obj1.left + 50;
obj2.top = obj1.top;
} else if ("_objects" in event.target) {
if (event.target["_objects"].includes(obj1)) {
obj2.left = obj1.left + event.target.left + event.target.width / 2 + 50;
obj2.top = obj1.top + event.target.top + event.target.height / 2;
}
}
});
}
var canvas = new fabric.Canvas("fabriccanvas");
var A1 = new fabric.Rect({
width: 200,
height: 100,
left: 0,
top: 50,
angle: 30,
fill: 'rgb(255,0,0)'
});
var A2 = new fabric.Rect({
width: 200,
height: 100,
left: 50,
top: 50,
angle: 30,
fill: 'rgba(255,0,0,0.5)',
selectable: false,
});
var B1 = new fabric.Rect({
width: 100,
height: 100,
left: 35,
top: 25,
angle: -10,
fill: 'rgb(0,200,0)'
});
var B2 = new fabric.Rect({
width: 100,
height: 100,
left: 85,
top: 25,
angle: -10,
fill: 'rgba(0,200,0,0.5)',
selectable: false,
});
bind(A1, A2);
bind(B1, B2);
canvas.add(A1, A2, B1, B2);
</script>
</body>
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