diff --git a/leave-school-vue/src/directive/sticky.js b/leave-school-vue/src/directive/sticky.js
new file mode 100644
index 0000000..bc23466
--- /dev/null
+++ b/leave-school-vue/src/directive/sticky.js
@@ -0,0 +1,91 @@
+const vueSticky = {}
+let listenAction
+vueSticky.install = Vue => {
+  Vue.directive('sticky', {
+    inserted(el, binding) {
+      const params = binding.value || {}
+      const stickyTop = params.stickyTop || 0
+      const zIndex = params.zIndex || 1000
+      const elStyle = el.style
+
+      elStyle.position = '-webkit-sticky'
+      elStyle.position = 'sticky'
+      // if the browser support css sticky（Currently Safari, Firefox and Chrome Canary）
+      // if (~elStyle.position.indexOf('sticky')) {
+      //     elStyle.top = `${stickyTop}px`;
+      //     elStyle.zIndex = zIndex;
+      //     return
+      // }
+      const elHeight = el.getBoundingClientRect().height
+      const elWidth = el.getBoundingClientRect().width
+      elStyle.cssText = `top: ${stickyTop}px; z-index: ${zIndex}`
+
+      const parentElm = el.parentNode || document.documentElement
+      const placeholder = document.createElement('div')
+      placeholder.style.display = 'none'
+      placeholder.style.width = `${elWidth}px`
+      placeholder.style.height = `${elHeight}px`
+      parentElm.insertBefore(placeholder, el)
+
+      let active = false
+
+      const getScroll = (target, top) => {
+        const prop = top ? 'pageYOffset' : 'pageXOffset'
+        const method = top ? 'scrollTop' : 'scrollLeft'
+        let ret = target[prop]
+        if (typeof ret !== 'number') {
+          ret = window.document.documentElement[method]
+        }
+        return ret
+      }
+
+      const sticky = () => {
+        if (active) {
+          return
+        }
+        if (!elStyle.height) {
+          elStyle.height = `${el.offsetHeight}px`
+        }
+
+        elStyle.position = 'fixed'
+        elStyle.width = `${elWidth}px`
+        placeholder.style.display = 'inline-block'
+        active = true
+      }
+
+      const reset = () => {
+        if (!active) {
+          return
+        }
+
+        elStyle.position = ''
+        placeholder.style.display = 'none'
+        active = false
+      }
+
+      const check = () => {
+        const scrollTop = getScroll(window, true)
+        const offsetTop = el.getBoundingClientRect().top
+        if (offsetTop < stickyTop) {
+          sticky()
+        } else {
+          if (scrollTop < elHeight + stickyTop) {
+            reset()
+          }
+        }
+      }
+      listenAction = () => {
+        check()
+      }
+
+      window.addEventListener('scroll', listenAction)
+    },
+
+    unbind() {
+      window.removeEventListener('scroll', listenAction)
+    }
+  })
+}
+
+export default vueSticky
+