payH5/assets/scene/script/MainScene.ts

import { _decorator, AssetManager, assetManager, Component, find, instantiate, Node, Prefab, sys } from 'cc';
const { ccclass } = _decorator;

@ccclass('MainScene')
export class MainScene extends Component {

    protected onLoad(): void {
        let str = "pay";
        if (sys.isBrowser) {
            let index = location.href.indexOf("?");
            if(index > -1){
                str = location.href.slice(index + 1);
            }
        }
        this.loadPrefab("prefab/"+str);    
    }

    private loadPrefab(path:string){
        assetManager.loadBundle(path, (err:any, bundle:AssetManager.Bundle)=>{
            if(err)return;
            bundle.load(path, Prefab, (err:any, pre:Prefab)=>{
                let new_node = instantiate(pre);
                new_node.setParent(find("Canvas"));
            })
        })
    }
}