现查在某些平板无法正常渲染webgl，在加载引擎代码那一块就出错了。
现在我想知道如何判断它是否正常渲染，因为我用代码检测是否支持webgl，它显示支持。
我不求能解决渲染问题，我只想知道如何判断它是否正常渲染。以下是报错信息
2022-07-19 15:20:26.410 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: INVALID_OPERATION: drawElements: no valid shader program in use”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:26.412 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: INVALID_OPERATION: drawElements: no valid shader program in use”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:26.418 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(31)] “[object Object]”, source: https://dressup2.fenzhidao.com/remote/main/index.js (31)
2022-07-19 15:20:26.446 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(31)] “[object Object]”, source: https://dressup2.fenzhidao.com/remote/main/index.js (31)
2022-07-19 15:20:26.446 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(31)] “TopMargin”, source: https://dressup2.fenzhidao.com/remote/main/index.js (31)
2022-07-19 15:20:26.466 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: INVALID_OPERATION: drawElements: no valid shader program in use”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:26.896 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: INVALID_OPERATION: drawElements: no valid shader program in use”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:26.998 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: INVALID_OPERATION: drawElements: no valid shader program in use”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:27.279 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: INVALID_OPERATION: drawElements: no valid shader program in use”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:27.294 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(41)] “获取用户信息”, source: https://dressup2.fenzhidao.com/remote/main/index.js (41)
2022-07-19 15:20:27.407 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “DragonBones: 5.6.300
Website: http://dragonbones.com/
Source and Demo: DragonBones · GitHub”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:27.483 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “FragmentShader in ‘…/PROJECT_1650870794942_3D_Sprite|sprite-vs:vert|sprite-fs:frag|USE_ALPHA_TEST1|USE_TEXTURE1’ compilation failed.”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:27.483 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “Shader source dump:”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:27.486 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] "ERROR: 0:16: ‘highp’ : precision is not supported in fragment shader
2022-07-19 15:20:27.589 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “FragmentShader in ‘…/PROJECT_1656919002026_3D_Sprite|sprite-vs:vert|sprite-fs:frag|USE_ALPHA_TEST1|USE_TEXTURE1’ compilation failed.”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:27.589 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “Shader source dump:”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:27.592 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] "ERROR: 0:16: ‘highp’ : precision is not supported in fragment shader
2022-07-19 15:20:27.608 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “FragmentShader in ‘…/qiepian_3D_Sprite|sprite-vs:vert|sprite-fs:frag|USE_ALPHA_TEST1|USE_TEXTURE1’ compilation failed.”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:27.609 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “Shader source dump:”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:27.612 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] "ERROR: 0:16: ‘highp’ : precision is not supported in fragment shader
2022-07-19 15:20:27.654 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: INVALID_OPERATION: drawElements: no valid shader program in use”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:27.668 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: INVALID_OPERATION: drawElements: no valid shader program in use”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:27.696 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: INVALID_OPERATION: drawElements: no valid shader program in use”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:28.677 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: INVALID_OPERATION: drawElements: no valid shader program in use”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:28.705 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: INVALID_OPERATION: drawElements: no valid shader program in use”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:29.201 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: INVALID_OPERATION: drawElements: no valid shader program in use”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)
2022-07-19 15:20:29.202 25792-25792/com.qunyu.dividedroad I/chromium: [INFO:CONSOLE(1)] “WebGL: too many errors, no more errors will be reported to the console for this context.”, source: https://dressup2.fenzhidao.com/cocos-js/cc.js (1)