聚焦于第一个表单字段

因隐藏字段不支持focus()方法，故需排除掉

 

<script type="text/ecmascript">
        window.onload = 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;
                    }
                }
            }
        } 
    </script>