不支持WebGL里面的一些枚举和方法,总之就是报很多错
[Cesium WebGL] Fragment shader compile log: Shader compilation errors
(0, 0): Maximum shader complexity exceeded
An error occurred while rendering.  Rendering has stopped.
undefined
RuntimeError: Fragment shader failed to compile.  Compile log: Shader compilation errors
(0, 0): Maximum shader complexity exceeded
Error
   at t (eval code:1:26193)
   at f (eval code:1:957242)
   at y (eval code:1:959689)
   at _bind (eval code:1:960784)
   at Y (eval code:1:2376429)
   at draw (eval code:1:2381377)
   at execute (eval code:1:922871)
   at execute (eval code:1:3870088)
   at w (eval code:1:3983978)
   at execute (eval code:1:3989908)