Cocos Creator 动态设置Canvas的宽度与高度，更改适配

let c = this.node.getComponent(cc.Canvas);
c.fitHeight = true;
c.fitWidth = false;

let h = 960 * cc.winSize.height / cc.winSize.width;

c.designResolution = new cc.Size(960, h);
this.node.setContentSize(960, h);

// 适配解决方案
        let _canvas = cc.Canvas.instance;
// 设计分辨率比
        let _rateR = _canvas.designResolution.height/_canvas.designResolution.width;
// 显示分辨率比
        let _rateV = cc.winSize.height/cc.winSize.width;
        console.log("winSize: rateR: "+_rateR+" rateV: "+_rateV);
        if (_rateV > _rateR)
        {
            _canvas.fitHeight = false;
            _canvas.fitWidth = true;
            console.log("winSize: fitWidth");
        }
        else
        {
            _canvas.fitHeight = true;
            _canvas.fitWidth = false;
            console.log("winSize: fitHeight");
        }

三点注意事项：

1.主域和子域的设计分辨率和适配方案要相同

2.sharedCanvas 不要设置宽高

3.承载sharedCanvas 的sprite要根据实际分辨率动态调整