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node_modules/vant/es/nav-bar/index.css

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+.van-nav-bar{position:relative;z-index:1;line-height:22px;text-align:center;background-color:#fff;-webkit-user-select:none;user-select:none}.van-nav-bar--fixed{position:fixed;top:0;left:0;width:100%}.van-nav-bar--safe-area-inset-top{padding-top:constant(safe-area-inset-top);padding-top:env(safe-area-inset-top)}.van-nav-bar .van-icon{color:#1989fa}.van-nav-bar__content{position:relative;display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;height:46px}.van-nav-bar__arrow{margin-right:4px;font-size:16px}.van-nav-bar__title{max-width:60%;margin:0 auto;color:#323233;font-weight:500;font-size:16px}.van-nav-bar__left,.van-nav-bar__right{position:absolute;top:0;bottom:0;display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;padding:0 16px;font-size:14px;cursor:pointer}.van-nav-bar__left:active,.van-nav-bar__right:active{opacity:.7}.van-nav-bar__left{left:0}.van-nav-bar__right{right:0}.van-nav-bar__text{color:#1989fa}

node_modules/vant/es/nav-bar/index.js

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+// Utils
+import { createNamespace } from '../utils';
+import { BORDER_BOTTOM } from '../utils/constant'; // Components
+
+import Icon from '../icon';
+
+var _createNamespace = createNamespace('nav-bar'),
+    createComponent = _createNamespace[0],
+    bem = _createNamespace[1];
+
+export default createComponent({
+  props: {
+    title: String,
+    fixed: Boolean,
+    zIndex: [Number, String],
+    leftText: String,
+    rightText: String,
+    leftArrow: Boolean,
+    placeholder: Boolean,
+    safeAreaInsetTop: Boolean,
+    border: {
+      type: Boolean,
+      default: true
+    }
+  },
+  data: function data() {
+    return {
+      height: null
+    };
+  },
+  mounted: function mounted() {
+    var _this = this;
+
+    if (this.placeholder && this.fixed) {
+      var setHeight = function setHeight() {
+        _this.height = _this.$refs.navBar.getBoundingClientRect().height;
+      };
+
+      setHeight(); // https://github.com/vant-ui/vant/issues/10131
+
+      setTimeout(setHeight, 100);
+    }
+  },
+  methods: {
+    genLeft: function genLeft() {
+      var h = this.$createElement;
+      var leftSlot = this.slots('left');
+
+      if (leftSlot) {
+        return leftSlot;
+      }
+
+      return [this.leftArrow && h(Icon, {
+        "class": bem('arrow'),
+        "attrs": {
+          "name": "arrow-left"
+        }
+      }), this.leftText && h("span", {
+        "class": bem('text')
+      }, [this.leftText])];
+    },
+    genRight: function genRight() {
+      var h = this.$createElement;
+      var rightSlot = this.slots('right');
+
+      if (rightSlot) {
+        return rightSlot;
+      }
+
+      if (this.rightText) {
+        return h("span", {
+          "class": bem('text')
+        }, [this.rightText]);
+      }
+    },
+    genNavBar: function genNavBar() {
+      var _ref;
+
+      var h = this.$createElement;
+      return h("div", {
+        "ref": "navBar",
+        "style": {
+          zIndex: this.zIndex
+        },
+        "class": [bem({
+          fixed: this.fixed,
+          'safe-area-inset-top': this.safeAreaInsetTop
+        }), (_ref = {}, _ref[BORDER_BOTTOM] = this.border, _ref)]
+      }, [h("div", {
+        "class": bem('content')
+      }, [this.hasLeft() && h("div", {
+        "class": bem('left'),
+        "on": {
+          "click": this.onClickLeft
+        }
+      }, [this.genLeft()]), h("div", {
+        "class": [bem('title'), 'van-ellipsis']
+      }, [this.slots('title') || this.title]), this.hasRight() && h("div", {
+        "class": bem('right'),
+        "on": {
+          "click": this.onClickRight
+        }
+      }, [this.genRight()])])]);
+    },
+    hasLeft: function hasLeft() {
+      return this.leftArrow || this.leftText || this.slots('left');
+    },
+    hasRight: function hasRight() {
+      return this.rightText || this.slots('right');
+    },
+    onClickLeft: function onClickLeft(event) {
+      this.$emit('click-left', event);
+    },
+    onClickRight: function onClickRight(event) {
+      this.$emit('click-right', event);
+    }
+  },
+  render: function render() {
+    var h = arguments[0];
+
+    if (this.placeholder && this.fixed) {
+      return h("div", {
+        "class": bem('placeholder'),
+        "style": {
+          height: this.height + "px"
+        }
+      }, [this.genNavBar()]);
+    }
+
+    return this.genNavBar();
+  }
+});

node_modules/vant/es/nav-bar/index.less

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+@import '../style/var';
+
+.van-nav-bar {
+  position: relative;
+  z-index: @nav-bar-z-index;
+  line-height: @line-height-lg;
+  text-align: center;
+  background-color: @nav-bar-background-color;
+  user-select: none;
+
+  &--fixed {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+  }
+
+  &--safe-area-inset-top {
+    padding-top: constant(safe-area-inset-top);
+    padding-top: env(safe-area-inset-top);
+  }
+
+  .van-icon {
+    color: @nav-bar-icon-color;
+  }
+
+  &__content {
+    position: relative;
+    display: flex;
+    align-items: center;
+    height: @nav-bar-height;
+  }
+
+  &__arrow {
+    margin-right: @padding-base;
+    font-size: @nav-bar-arrow-size;
+  }
+
+  &__title {
+    max-width: 60%;
+    margin: 0 auto;
+    color: @nav-bar-title-text-color;
+    font-weight: @font-weight-bold;
+    font-size: @nav-bar-title-font-size;
+  }
+
+  &__left,
+  &__right {
+    position: absolute;
+    top: 0;
+    bottom: 0;
+    display: flex;
+    align-items: center;
+    padding: 0 @padding-md;
+    font-size: @font-size-md;
+    cursor: pointer;
+
+    &:active {
+      opacity: @active-opacity;
+    }
+  }
+
+  &__left {
+    left: 0;
+  }
+
+  &__right {
+    right: 0;
+  }
+
+  &__text {
+    color: @nav-bar-text-color;
+  }
+}

node_modules/vant/es/nav-bar/style/index.js

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+import '../../style/base.css';
+import '../../info/index.css';
+import '../../icon/index.css';
+import '../index.css';

node_modules/vant/es/nav-bar/style/less.js

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+import '../../style/base.less';
+import '../../info/index.less';
+import '../../icon/index.less';
+import '../index.less';