//勾选框
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);
// 单击选中
if(options.clickToChecked===true){
a.on('click',checked);
}
};
