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el-switch的before-change的使用方法
el-switch切换之前先确认是否要进行切换，做二次确认、使用before-change

	<el-switch v-model="scope.row[item.key]" :before-change="() => beforeSwitchChange(scope.row)" @change="onSwitchChange(scope.row)" />

	const onSwitchChange = (val: any) => {emit('switchChange', val);};const beforeSwitchChange = (val: any) => {const status = ElMessageBox.confirm(`是否切换?`, '提示', {confirmButtonText: '确认',cancelButtonText: '取消',type: 'warning',}).then(() => {return true;}).catch(() => {return false;});return new Promise((resolve, reject) => {if (status) {// 点击确认按钮时设置tags值return resolve(status);} else {return reject(status);}});};