var msg = obj.getAttribute("msg") != null ? obj.getAttribute("msg") : " ";//默认为一空格
var required = obj.getAttribute("required") != "no";//默认为yes
var span = nextSibling(obj);
var checked = span != null ? span.nodeName == "SPAN" : false;
var required = obj.getAttribute("required") != "no";//默认为yes
var span = nextSibling(obj);
var checked = span != null ? span.nodeName == "SPAN" : false;