function geTel(tel){ var reg = /^(\d{3})\d{4}(\d{4})$/; return tel.replace(reg, "$1****$2"); } //测试 var tel = "17326453333"; console.log(geTel(tel));//173****3333 4. 通过长度截取
function geTel(tel){ return tel.substring(0, 3)+"****"+tel.substr(tel.length-4); } //测试 var tel = "17326453333"; console.log(geTel(tel));//173****3333