1、radio的值为5时输入框是必填，其余时候是非必填

2、看图

3、代码

data() {return {optForm:{type:'',remark:'',},rules:{type:[{ required: true,trigger: 'change',message:'该项为必填项'}],remark:[]}};},watch: {"optForm.type"(newVal, oldVal) {this.$nextTick(() => {this.updateRules();});}},
methods: {updateRules() {this.rules.remark = []; // 清空当前字段的验证规则if (this.optForm.type === '5') {// 如果选择了需要必填的选项，添加必填验证规则this.$set(this.rules, 'remark', [{ required: true, message: '该项为必填项', trigger: 'blur' }]);}},
}