Set form elements with random value based on pattern value attribute
support fill input with random string based on pattern value attribute;
support auto select option;
support radio and checkbox auto checked;
support fill or empty with input:requierd;
support more html5 input type: email, number, url, mobile, tel;
针对表单input元素上的pattern属性的正则值，随机生成匹配的字符串填充；
针对select元素的option值，选中不为空的option；
支持单选复选框的选中；
支持清空表单填充数据；
支持针对必填:required元素和全部元素填充；
支持html5 input type: email, number, url, mobile, tel