离校前端框架，包括数据字典、工作队伍、新闻公告模块
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
+