输入框只允许输入数字字母下划线

<el-inputv-model="confirmForm.tenantName"size="mini"class="item-left"></el-input>

var checkNameReg = (rule, value, callback) => {// 用户名限制if (!value) {return callback()}if (value) {setTimeout(() => {var reg = /^[a-zA-Z]+[\d\w]*$/if (!reg.test(value)) {callback(new Error('只能输入英文、数字、下划线!'))} else {callback()}}, 100)}}

rules: {tenantName: [{ validator: checkNameReg }, { required: true, message: '输入租户名称', trigger: 'blur' }],},