Box2DWeb_04之Joint

Joint ! 是用来链接body和body直接的对象！

总共有8种joint，分别使用在不同的目的的链接中！

Mouse joint

Distance joint

Revolute joint 

Prismatic joint

Pulley joint 

Gear joint 

Line joint 

Weld joint

我们有关于的所有事例都是基于

  function init(){

    var canvas = document.getElementById("stage");
    canvas.addEventListener("mousedown",mouseDown,true);
    canvas.addEventListener("mouseup",mouseUp,true);
    context = canvas.getContext("2d");
    createWorld();
    createWall();
    createDistance();
//    createRevolute(); 
//    createPrismatic();
//    createPulley(); 
//    createGear(); 
//    createLine(); 
//    createWeld();
};