新建一个空节点，添加脚本，设置背景图片和速度就可以了。注意：脚本是TS脚本
const { ccclass, property } = cc._decorator;
@ccclass
export default class NewClass extends cc.Component {
@property(cc.SpriteFrame)
BackGround: cc.SpriteFrame = null;
@property
speed: number = -100;
node1: cc.Node;
node2: cc.Node;
winHeight: number;
onLoad() {
this.node1 = this.addnode();
this.node2 = this.addnode();
this.winHeight = cc.director.getWinSize().height;
this.node1.y = 0;
if (this.speed > 0) {
this.node2.y = -this.winHeight;
}
else {
this.node2.y = this.winHeight;
}
}
start() {
}
update(dt) {
this.node2.y += this.speed * dt;
this.node1.y += this.speed * dt;
if (this.speed > 0) {
if (this.node1.y >= this.winHeight) this.node1.y = this.node2.y - this.winHeight;
if (this.node2.y >= this.winHeight) this.node2.y = this.node1.y - this.winHeight;
}
else {
if (this.node1.y <= -this.winHeight) this.node1.y = this.node2.y + this.winHeight;
if (this.node2.y <= -this.winHeight) this.node2.y = this.node1.y + this.winHeight;
}
}
addnode() {
var node = new cc.Node("BG");
var sp = node.addComponent(cc.Sprite);
sp.spriteFrame = this.BackGround;
node.parent = this.node;
node.width = cc.director.getWinSize().width;
node.height = cc.director.getWinSize().height;
return node;
}
}