判断数据是否为空数据

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/**  * 判断是否为空  */ export function empty (value) {     switch (typeof value) {         case 'undefined':             return true         case 'string':             if (value.replace(/(^[ \t\n\r]*)|([ \t\n\r]*$)/g, '').length == 0) return true             break         case 'boolean':             if (!value) return true             break         case 'number':             if (value === 0 || isNaN(value)) return true             break         case 'object':             if (value === null || value.length === 0) return true             for (const i in value) {                 return false             }             return true     }     return false }