在一个el-form表单中有5个el-form-item;

每个el-form-item是一个el-select控件；

这5个el-select控件遵循这样的规则，都是使用同一个list集合，如果第一个el-select选择了list中的某一项，那么这一项就被禁用；其他的el-selet就不能选择这一项了；

如果第二个el-select选择了list中的某一项，那么这一项和第一个el-select选择的项都禁用，

其他的el-select就不能选择这两项了；以此类推

<template><div><el-form :model='form' :rules="rules" ref="form"><el-form-item v-for="(select, index) in selects" :key="index" :label="'Select ' + (index + 1)"prop="selectedOptions"><el-select v-model="form.selectedOptions[index]" @change="handleSelectChange(index)" @clear="handleSelectClear(index)" clearable><el-option v-for="option in options" :key="option.value" :label="option.label" :value="option.value" :disabled="isOptionDisabled(option.value)"></el-option></el-select></el-form-item><!-- <el-button type="primary" @click="submitForm">Submit</el-button> --></el-form></div>
</template>

Js代码：

<script>
export default {data() {return {options: [{ label: 'Option 1', value: 1 },{ label: 'Option 2', value: 2 },{ label: 'Option 3', value: 3 },{ label: 'Option 4', value: 4 },{ label: 'Option 5', value: 5 }],form:{selectedOptions: [null, null, null, null, null],disabledOptions: [], // 禁用的选项集合},rules: {selectedOptions: [{ required: true, message: 'Please select at least one option', trigger: 'blur' }]}};},computed: {selects() {return Array.from({ length: 5 });}},methods: {// 下拉框选择事件handleSelectChange(index) {this.form.disabledOptions = [];console.log(this.form.selectedOptions,'+++++++ ')for (let i = 0; i < this.form.selectedOptions.length; i++) {if (this.form.selectedOptions[i] !== null) {this.form.disabledOptions.push(this.form.selectedOptions[i]);}}},// 下拉框清除事件handleSelectClear(index) {const clearedValue = this.form.selectedOptions[index];const indexToRemove = this.form.disabledOptions.indexOf(clearedValue);if (indexToRemove !== -1) {this.form.disabledOptions.splice(indexToRemove, 1);}},//是否禁用isOptionDisabled(value) {return this.form.disabledOptions.includes(value);}}
};
</script>