1、切割法

<div style="margin: 15px 0">已将验证码发送绑定手机号码{{userTelephoneNum}}</div>
const phone = '17786292509'     //后续更换接口返回的电话号码
this.userTelephoneNum = phone.substr(0, 3) + '****' + phone.substr(7) 

2、正则表达式法

const phone = '17786292509'     //后续更换接口返回的电话号码
this.userTelephoneNum = phone.replace(/(\d{3})\d{4}(\d{4})/, '$1****$2');

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