Menu support transition fixed #514

src/utils/assist.js

@@ -232,4 +232,66 @@ function findComponentsDownward (context, componentName, components = []) {
     }
     return components;
 }
-export {findComponentsDownward};
+export {findComponentsDownward};
+
+/* istanbul ignore next */
+const trim = function(string) {
+    return (string || '').replace(/^[\s\uFEFF]+|[\s\uFEFF]+$/g, '');
+};
+
+/* istanbul ignore next */
+export function hasClass(el, cls) {
+    if (!el || !cls) return false;
+    if (cls.indexOf(' ') !== -1) throw new Error('className should not contain space.');
+    if (el.classList) {
+        return el.classList.contains(cls);
+    } else {
+        return (' ' + el.className + ' ').indexOf(' ' + cls + ' ') > -1;
+    }
+}
+
+/* istanbul ignore next */
+export function addClass(el, cls) {
+    if (!el) return;
+    let curClass = el.className;
+    const classes = (cls || '').split(' ');
+
+    for (let i = 0, j = classes.length; i < j; i++) {
+        const clsName = classes[i];
+        if (!clsName) continue;
+
+        if (el.classList) {
+            el.classList.add(clsName);
+        } else {
+            if (!hasClass(el, clsName)) {
+                curClass += ' ' + clsName;
+            }
+        }
+    }
+    if (!el.classList) {
+        el.className = curClass;
+    }
+}
+
+/* istanbul ignore next */
+export function removeClass(el, cls) {
+    if (!el || !cls) return;
+    const classes = cls.split(' ');
+    let curClass = ' ' + el.className + ' ';
+
+    for (let i = 0, j = classes.length; i < j; i++) {
+        const clsName = classes[i];
+        if (!clsName) continue;
+
+        if (el.classList) {
+            el.classList.remove(clsName);
+        } else {
+            if (hasClass(el, clsName)) {
+                curClass = curClass.replace(' ' + clsName + ' ', ' ');
+            }
+        }
+    }
+    if (!el.classList) {
+        el.className = trim(curClass);
+    }
+}