判断元素是否为空:
/*** 判断是否为空*/
export function validatenull(val) {if (typeof val === 'boolean') {return false}if (typeof val === 'number') {return false}if (val instanceof Array) {if (val.length===0) return true} else if (val instanceof Object) {if (JSON.stringify(val) === '{}') return true} else {if (val === 'null' || val === null || val === 'undefined' || val === undefined || val === '') return truereturn false}return false
}
使用方法: