budingGame/assets/Script/Game/CameraControl.js

// Learn cc.Class:
//  - [Chinese] http://www.cocos.com/docs/creator/scripting/class.html
//  - [English] http://www.cocos2d-x.org/docs/editors_and_tools/creator-chapters/scripting/class/index.html
// Learn Attribute:
//  - [Chinese] http://www.cocos.com/docs/creator/scripting/reference/attributes.html
//  - [English] http://www.cocos2d-x.org/docs/editors_and_tools/creator-chapters/scripting/reference/attributes/index.html
// Learn life-cycle callbacks:
//  - [Chinese] http://www.cocos.com/docs/creator/scripting/life-cycle-callbacks.html
//  - [English] http://www.cocos2d-x.org/docs/editors_and_tools/creator-chapters/scripting/life-cycle-callbacks/index.html

cc.Class({
    extends: cc.Component,

    properties: {
        target: {
            default: null,
            type: cc.Node
        },

        lastUpdateTargerPosY:0
    },

    // use this for initialization
    onLoad: function () {
        this.camera = this.getComponent(cc.Camera);
    },

    onEnable: function () {
        // cc.director.getPhysicsManager().attachDebugDrawToCamera(this.camera);
        //cc.director.getCollisionManager().attachDebugDrawToCamera(this.camera);
    },
    onDisable: function () {
        // cc.director.getPhysicsManager().detachDebugDrawFromCamera(this.camera);
        //cc.director.getCollisionManager().detachDebugDrawFromCamera(this.camera);
    },

    resetData: function()
    {
        this.lastUpdateTargerPosY = 0;
    },

    // called every frame, uncomment this function to activate update callback
    lateUpdate: function (dt) {
        //let targetPos = this.target.convertToWorldSpaceAR(cc.Vec2.ZERO);
        //this.node.position = this.node.convertToNodeSpaceAR(targetPos);

        var isUp = true;
        if (this.target.position.y > 0) 
        {
            if (this.target.position.y - this.lastUpdateTargerPosY > 0) 
            {
                this.lastUpdateTargerPosY = this.target.position.y;
            }
            else
            {
                isUp = false;
            }
            
        }

        if (isUp && this.target.position.y > 0) 
        {     
             this.node.position = this.target.position;
        }

        
        // let ratio = targetPos.y / cc.winSize.height;
        // this.camera.zoomRatio = 1 + (0.5 - ratio) * 0.5;
    },
});