1.8 版本

src/utils/index.js

@@ -116,3 +116,34 @@ export function regMobile(mobile) {
   }
   return new_mobile
 }
+
+/**
+ * Check if an element has a class
+ * @param {HTMLElement} elm
+ * @param {string} cls
+ * @returns {boolean}
+ */
+export function hasClass(ele, cls) {
+  return !!ele.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'))
+}
+
+/**
+ * Add class to element
+ * @param {HTMLElement} elm
+ * @param {string} cls
+ */
+export function addClass(ele, cls) {
+  if (!hasClass(ele, cls)) ele.className += ' ' + cls
+}
+
+/**
+ * Remove class from element
+ * @param {HTMLElement} elm
+ * @param {string} cls
+ */
+export function removeClass(ele, cls) {
+  if (hasClass(ele, cls)) {
+    const reg = new RegExp('(\\s|^)' + cls + '(\\s|$)')
+    ele.className = ele.className.replace(reg, ' ')
+  }
+}