//两种方法设置disabled属性
$('#fileup').attr("disabled",true);
$('#fileup').attr("disabled","disabled");
//三种方法移除disabled属性
$('#fileup').attr("disabled",false);
$('#fileup').removeAttr("disabled");
$('#fileup').attr("disabled","");
//两种方法设置disabled属性
$('#fileup').attr("disabled",true);
$('#fileup').attr("disabled","disabled");
//三种方法移除disabled属性
$('#fileup').attr("disabled",false);
$('#fileup').removeAttr("disabled");
$('#fileup').attr("disabled","");