//勾選框
Tree.prototype.checkbox = function(elem, item){
??var that = this, options = that.options;
??var a = elem.children('a');
??var box = elem.children('.layui-tree-check');
??var checked = function () {?
????if(elem.data('checked')==='yes'){
??????var childBox = elem.children('ul').find('.layui-tree-check');
??????elem.data('checked','no');
??????box.html(icon.checkbox[0]);
? ? ? childBox.html(icon.checkbox[0])
? ? ? ? ? ? ? .parent().data('checked','no');
????}else{
??????var parentBox = elem.parent('ul')
? ? ? ? ? ? ? ? ? ? ? ? ? .parentsUntil($(options.elem).parent(),'li')
? ? ? ? ? ? ? ? ? ? ? ? ? .find('.layui-tree-check:first');
? ? ? elem.data('checked','yes');
??????box.html(icon.checkbox[1]);
??????parentBox.html(icon.checkbox[1])
????????.parent().data('checked','yes');
????}
??};
??box.on('click', checked);
??// 單擊選中
??if(options.clickToChecked===true){
????a.on('click',checked);
??}
? };
