The method of extjs to assign a value to a property in the object of the component

that's right

form.getViewModel().set('activateCode',response.responseText);

 
that's right

var model=form.getViewModel();
model.set('activateCode',response.responseText);

 

That's right too

var model=form.getViewModel();
model.set('activateCode',response.responseText);
form.setViewModel(model);

 At the beginning, the last two methods were tried many times and they were wrong, but they were all right again. Writing a big generation is like hitting a big luck.