处理Element

  1. const processElement = (
  2.   n1,
  3.   n2,
  4.   container,
  5.   anchor,
  6.   parentComponent,
  7.   parentSuspense,
  8.   isSVG,
  9.   optimized
  10. ) => {
  11.   isSVG = isSVG || n2.type === 'svg'
  12.   if (n1 == null) {
  13.     mountElement(
  14.       n2,
  15.       container,
  16.       anchor,
  17.       parentComponent,
  18.       parentSuspense,
  19.       isSVG,
  20.       optimized
  21.     )
  22.   } else {
  23.     patchElement(n1, n2, parentComponent, parentSuspense, isSVG, optimized)
  24.   }
  25. }

总结：

该方法主要是做了2件事情：

  1. 不存在旧节点，挂载
  2. 存在旧节点，更新，执行 patchElement