JavaScript聚焦于第一个字段的代码

FormUtil.focusOnFirst = function() { 
if (document.forms.length > 0) { 
for (var i = 0; i < document.forms[0].elements.length; i++) { 
var oField = document.forms[0].elements[i]; 
if (oField.type != "hidden") { 
oField.focus(); 
return; 
} 
} 
} 
}