优化 tree 的 `checked,spread` 属性赋值机制

src/modules/tree.js

@@ -296,10 +296,12 @@ layui.define('form', function(exports){
           elem.removeClass(ELEM_SPREAD);
           packCont.slideUp(200);
           iconClick.removeClass(ICON_SUB).addClass(ICON_ADD); 
+          that.updateFieldValue(item, 'spread', false);
         }else{
           elem.addClass(ELEM_SPREAD);
           packCont.slideDown(200);
           iconClick.addClass(ICON_SUB).removeClass(ICON_ADD);
+          that.updateFieldValue(item, 'spread', true);
 
           // 是否手风琴
           if(options.accordion){
@@ -328,7 +330,7 @@ layui.define('form', function(exports){
 
       // 获取选中状态
       if(elemCheckbox[0]){
-        that.setCheckValue(item, elemCheckbox.prop('checked'));
+        that.updateFieldValue(item, 'checked', elemCheckbox.prop('checked'));
       }
       
       // 点击产生的回调
@@ -340,11 +342,9 @@ layui.define('form', function(exports){
     });
   };
 
-  // 设置数据源 checked 字段值
-  Class.prototype.setCheckValue = function(obj, checked){
-    if('checked' in obj){
-      obj.checked = checked;
-    }
+  // 更新数据源 checked,spread 字段值
+  Class.prototype.updateFieldValue = function(obj, field, value){
+    if(field in obj) obj[field] = value;
   };
   
   // 计算复选框选中状态
@@ -361,8 +361,8 @@ layui.define('form', function(exports){
       elemCheckboxs.each(function(index){
         if(this.disabled) return; // 不可点击则跳过
         var children = item.children[index];
-        if(children) that.setCheckValue(children, checked);
-        that.setCheckValue(this, checked);
+        if(children) that.updateFieldValue(children, 'checked', checked);
+        that.updateFieldValue(this, 'checked', checked);
       });
     };
 
@@ -418,7 +418,7 @@ layui.define('form', function(exports){
       if(elemCheckbox.prop('disabled')) return;
       
       that.setCheckbox(elem, item, elemCheckbox);
-      that.setCheckValue(item, checked);
+      that.updateFieldValue(item, 'checked', checked);
 
       // 复选框点击产生的回调
       options.oncheck && options.oncheck({
@@ -763,7 +763,7 @@ layui.define('form', function(exports){
       layui.each(data, function(index, item){
         layui.each(checkId, function(index2, item2){
           if(item.id == item2){
-            that.setCheckValue(item, true);
+            that.updateFieldValue(item, 'checked', true);
 
             var cloneItem = $.extend({}, item);
             delete cloneItem.children;