省市区地址列表增加缓存 code review by @liangzhifeng

@@ -21,6 +21,7 @@ var $addressForm = $('.edit-address'),
     isSubmiting,
     currentPage = 'edit',
     newArea = [],
+    chinaAddressList,
     queryString = $.queryString();
 
 $($editAddressPage, $addressListPage).css('min-height', function() {
@@ -118,12 +119,7 @@ $submit.on('touchend', function() {
     $(this).removeClass('highlight');
 });
 
-// 省市区列表异步加载
-$.ajax({
-    method: 'GET',
-    url: '/home/locationList',
-    timeout: 60000
-}).then(function(html) {
+function bindAddressListEvent(html) {
     $addressListPage.html(html);
 
     // 省市区
@@ -185,6 +181,27 @@ $.ajax({
     }).on('touchend touchcancel', 'li', function() {
         $(this).removeClass('highlight');
     });
-}).fail(function() {
+}
+
+// 读取省市区列表缓存
+if (window.localStorage && window.localStorage.getItem) {
+    chinaAddressList = window.localStorage.getItem('chinaAddressList');
+}
+if (chinaAddressList) {
+    bindAddressListEvent(chinaAddressList);
+} else {
+
+    // 省市区列表异步加载
+    $.ajax({
+        method: 'GET',
+        url: '/home/locationList',
+        timeout: 60000
+    }).then(function(html) {
+        bindAddressListEvent(html);
+        if (window.localStorage && window.localStorage.setItem) {
+            window.localStorage.setItem('chinaAddressList', html);
+        }
+    }).fail(function() {
         tip.show('获取省市区列表失败');
-});
+    });
+}