【记录55】多个参数查询，无用参数不记查询

let students = [
    {name: '姓名', age: '年龄', sex: '性别', grade: '年级', location: '家庭地址', phone: '联系方式', studentID: '学号', enrollmentDate: '入学日期', major:'', class: '班级', performance: '成绩', rank: '排名', evaluation: '评价'},
    ...
    {name: '姓名', age: '年龄', sex: '性别', grade: '年级', location: '家庭地址', phone: '联系方式', studentID: '学号', enrollmentDate: '入学日期', major:'', class: '班级', performance: '成绩', rank: '排名', evaluation: '评价'},
]

页面有多个输入框条件查询，只输入年龄、年级、性别 为查询条件

cosnt findobj = { name: '', age: '', sex: '', grade: '', location: '', phone: '', studentID: '', enrollmentDate: '', major:'', class: '', performance: '', rank: '', evaluation: '' }

const resultobj; // 新对象
for(let key in finobj) {
	if( findobj[key] ){
	//验证该属性是否为真
         resultobj[key] = findobj[key];
    }
}
console.log(resultobj); // 结果：{age:'12', sex:'男', grade:'大一'}

过滤出了只需要查询的条件

let list = [];
for(let index=0; index < students.length; index++) {
	const item = students[index];
	const reg = new new RegExp(resultobj [key ]);
	for(let key in resultobj) {
		if(reg.test(item[key])) {
			list.push(item)
		}
	}
}
console.log(list);