input 控制输入非负数
onkeypress="return (/[\d]/.test(String.fromCharCode(event.keyCode)))" oninput="if(value.length>6)value=value.slice(0,6)"
onkeypress="return (/[\d]/.test(String.fromCharCode(event.keyCode)))" oninput="if(value.length>6)value=value.slice(0,6)"