话不多说直接上代码!
//设置disabled属性(两种方法)
$('#areaSelect').attr("disabled",true);
$('#areaSelect').attr("disabled","disabled");
//移除disabled属性(三种方法)
$('#areaSelect').attr("disabled",false);
$('#areaSelect').removeAttr("disabled");
$('#areaSelect').attr("disabled","");