正则表达式在safari和ios上浏览器不兼容 解决:用RegExp转换正则 https://www.lihuyong.com/archives/1461
subject must not be sentence-case, start-case, pascal-case, upper-case [subject-case] 解决:提交信息的开头不能为大写
event.preventDefault();//阻止默认行为 event.stopPropagation();//阻止事件冒泡