vue3.0 2021-05-16

1.diff算法优化，添加静态标记，需要改变的才做比较，达到了性能上的提升

静态提升

<div>
  <p>Xmo</p>
  <p>Xmo</p>
  <p>Xmo</p>
  <p>{{msg}}</p>
</div>

静态变量未提升

import { createVNode as _createVNode, toDisplayString as _toDisplayString, openBlock as _openBlock, createBlock as _createBlock } from "vue"

export function render(_ctx, _cache, $props, $setup, $data, $options) {
  return (_openBlock(), _createBlock("div", null, [
    _createVNode("p", null, "Xmo"),
    _createVNode("p", null, "Xmo"),
    _createVNode("p", null, "Xmo"),
    _createVNode("p", null, _toDisplayString(_ctx.msg), 1 /* TEXT */)
  ]))
}

提升后

import { createVNode as _createVNode, toDisplayString as _toDisplayString, openBlock as _openBlock, createBlock as _createBlock } from "vue"

const _hoisted_1 = /*#__PURE__*/_createVNode("p", null, "Xmo", -1 /* HOISTED */)
const _hoisted_2 = /*#__PURE__*/_createVNode("p", null, "Xmo", -1 /* HOISTED */)
const _hoisted_3 = /*#__PURE__*/_createVNode("p", null, "Xmo", -1 /* HOISTED */)

export function render(_ctx, _cache, $props, $setup, $data, $options) {
  return (_openBlock(), _createBlock("div", null, [
    _hoisted_1,
    _hoisted_2,
    _hoisted_3,
    _createVNode("p", null, _toDisplayString(_ctx.msg), 1 /* TEXT */)
  ]))
}