###求助 cocos2d-js 继承 PhysicsSprite ios运行出错 body is null

@fatihwk 写道：

在网页运行没有错误， 但编译运行ios版本时出现body is null错误，导致无法运行：

cocos2d: fullPathForFilename: No file found at script/jsb_prepare.jsc. Possible missing file.
cocos2d: fullPathForFilename: No file found at script/jsb_boot.jsc. Possible missing file.
JS: Cocos2d-JS v3.13
(evaluatedOK == JS_FALSE)
JS: /Users/q/Library/Developer/CoreSimulator/Devices/B2CDA198-FCB0-4E04-B9D5-6A3A0F93C4BF/data/Containers/Bundle/Application/9FEBE876-DAB6-429E-83A6-C4C171C7E788/
Tank-mobile.app/script/physicsSprite/jsb_physicsSprite.js:51:TypeError: body is null

Evaluating main.js failed (evaluatedOK == JS_FALSE)
2016-11-17 16:15:29.843 Tank-mobile[33112:552538] cocos2d: surface size: 1136x640
cocos2d: QuadCommand: resizing index size from [-1] to [2560]
2016-11-17 16:15:29.865 Tank-mobile[33112:552538] cocos2d: surface size: 1136x640

代码：

var Bullet = cc.PhysicsSprite.extend({
  attack:100,
  type:"bullet",
  uid:0,
  speed:10,
  phyBody:null,
  shape:null,
  world:null,
  isDead:false,

  ctor:function (target, pos,uid) {
    this._super();

cc.log("create bullet "); 
    this.world = target;

    this.uid = uid;
    this.initWithSpriteFrameName("bullet.png" );
    this.setAnchorPoint(0.5,0.5);

    var radius = this.getContentSize().width/2;
    mass = 2;
    this.phyBody = target.space.addBody(new cp.Body(mass, cp.momentForCircle(mass, 0, radius, cp.v(0, 0))));

    this.phyBody.owner = this;
    this.phyBody.setPos(pos);
    this.shape = new cp.CircleShape(this.phyBody, radius, cp.v(0, 0));
    var circle = target.space.addShape(this.shape);
    circle.setElasticity(1);
    circle.setFriction(0);
    circle.setCollisionType(collisions.COLLISIONS_TYPE_BULLET);

    this.body = this.phyBody; 
    this.setBody( this.phyBody );

          return this;
  },

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