Figure 1 according to the official tutorials, do this step, engine figure 2 mistakes, in figure 3 add this code can be normal preview before, has done before this step in figure 4, want to ask what this is

CodePudding user response:

It ought to be you the value of a variable in the onl oad uninitialized, you can call log and see what a line error,
Ps: don't use mobile phones according to computer image, so it's too difficult to see so nobody to answer