<input οninput="this.value=this.value.replace(/\D/g,'')" maxlength="4" v-model="code" placeholder="请输入验证码" />

<el-input v-model="unboundTel" placeholder="请输入解绑手机号" clearable @blur="unbondBlur" maxlength="11" οnkeyup="this.value=this.value.replace(/\D/g,'')"></el-input>