接上篇
第三步：参数处理
// 删除无用字段
Object.keys(copyParams).forEach(function (key) {
let val = copyParams[key]
if (val === null || val === '' || val === undefined || Number(val) === -1) {
delete copyParams[key]
}
// 数组 null
if (typeof copyParams[key] === 'object' && isEmpty(copyParams[key])) {
delete copyParams[key]
}
})
