隐藏手机号中间四位，改为**** (常见四种方法)

var phone='13511115678';
//方法一
var newphone=phone.substr(0, 3) + '****' + phone.substr(phone.length - 4);
//方法二
var newphone= phone.replace(phone.substr(3, 4),"****")
//方法三
var newphone=phone.replace(/(\d{3})\d{4}(\d{4})/, '$1****$2');
//方法四
var newphone=phone.replace( /([0-9]{3})([0-9]{4})([0-9]{4})/,"$1****$3")

详解方法三和四，如下：