代码

if(resName.endsWith('.png'))

报错信息如下，请大伙帮忙看看，实在没办法

TypeError: resName.endsWith is not a function
    at main.js:29
    at Array.forEach (<anonymous>)
    at Main.loadResources (main.js:28)
    at Main.start (main.js:17)
    at new Main (main.js:13)
    at game.js? [sm]:9
    at O (VM6051 WAGameSubContext.js:1)
    at <anonymous>:1:1
    at doWhenAllScriptLoaded (game.js:40)
    at game.js:14(env: Windows,mg,1.06.2208010; lib: 2.25.4)