Cannot read property 'on' of null

Cocos2d-x JavaScript
#1

image.png1785×720 76.1 KB

#2

`import { Canvas } from “…/creator”;

// 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: {
    // foo: {
    //     // ATTRIBUTES:
    //     default: null,        // The default value will be used only when the component attaching
    //                           // to a node for the first time
    //     type: cc.SpriteFrame, // optional, default is typeof default
    //     serializable: true,   // optional, default is true
    // },
    // bar: {
    //     get () {
    //         return this._bar;
    //     },
    //     set (value) {
    //         this._bar = value;
    //     }
    // },
   
    one: false,
    two: false,
    three: false,
    four: false,
    five: false,
    six: false,
    seven: false,
    eight: false,
},


// LIFE-CYCLE CALLBACKS:

// onLoad () {},
onLoad: function(){
    var self =this;
    // if(self.one){
    //     cc.find('Canvas/one').on('roateevent',self.listen,self);
    // }
    // if(self.two){
    //     cc.find('Canvas/two').on('roateevent',self.listen,self);
    // }
    // if(self.three){
    //     cc.find('Canvas/three').on('roateevent',self.listen,self);
    // }
    // if(self.four){
    //     cc.find('Canvas/four').on('roateevent',self.listen,self);
    // }
    // if(self.five){
    //     cc.find('Canvas/five').on('roateevent',self.listen,self);
    // }
    // if(self.six){
    //     cc.find('Canvas/six').on('roateevent',self.listen,self);
    // }
    // if(self.seven){
    //     cc.find('Canvas/seven').on('roateevent',self.listen,self);
    // }
    // if(self.eight){
    //     cc.find('Canvas/eight').on('roateevent',self.listen,self);
    // }

    self.node.on('mouseup',function(){
            self.node.emit('roateevent');
    });
},

listen:function(){
    this.node.runAction(cc.rotateBy(0.5,360));
},
start () {

},

// update (dt) {},

});
`

#3

根据目前信息，我只能判断出cc.find的结果为空。