http://brm.io/matter-js/docs/
https://github.com/liabru/matter-js

【点击事件 https://www.coder.work/article/7638867】

里面的点击对象必须用Mouse创建
var mouse = Matter.Mouse.create(render.canvas),
mouseConstraint = Matter.MouseConstraint.create(engine, {
mouse: mouse,
constraint: {
stiffness: 0.2,
render: {
visible: false
}
}
});

    Matter.Events.on(mouseConstraint, 'mousedown', function(event) {
         var mousePosition = event.mouse.position;
         console.log('mousedown at ' + mousePosition.x + ' ' + mousePosition.y);
    });

点击事件目前想的是点击的时候得到位置后 循环已知元素的位置 匹配
=====================已解决==================================
const rect2 = Bodies.rectangle(110,130,50,80);
rect2.label = "11111"
console.log("rect2",rect2)

        engine.world.gravity.y = 0.01

        World.add(engine.world,[rect,rect2]);
        Engine.run(engine);
        Render.run(render);
        
        var mouse = Matter.Mouse.create(render.canvas),
        mouseConstraint = Matter.MouseConstraint.create(engine, {
        mouse: mouse,
        constraint: {
            stiffness: 0.2,
            render: {
                visible: false
            },
        },
    });
    World.add(engine.world, mouseConstraint);
    Matter.Events.on(mouseConstraint, 'mousedown', function(event) {
         var mousePosition = event.mouse.position;
        //  console.log(mousePosition.x,"对象11==",event)
        //  console.log('mousedown at ' + mousePosition.x + ' ' + mousePosition.y);


        var bodiesUnder = Matter.Query.point([rect2], { x: mousePosition.x, y: mousePosition.y });
            //alert("click!\n" + mouseX2 + " " + mouseY2 +"\n");

            if (bodiesUnder.length > 0) {
            var bodyToClick = bodiesUnder[0];
            console.log("获取点击对象")
        }

    });