uniapp 修改meta:viewport

  onLoad(options) {
    this.setViewport(`width=device-width, initial-scale=1.0`);
  },
  onUnload() {
    this.setViewport(`width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, viewport-fit=cover`);
  },
  methods: {
    setViewport(content) {
      const meta = document.querySelector('meta[name=viewport]');
      if (!meta) return;
      meta.setAttribute('content', content);
    }
  },