大家帮忙看看这段代码什么意思

Question

var checkCardID = (rule, value, callback) => {        setTimeout(() => {            if(this.form.personIdInfoType === '20000'){                if (idCardNoUtil.checkIdCardNo(value)) {                    callback();                 } else {                    callback(new Error('请输入正确的身份证号码'));                 }             }else{                callback();             }         }, 1);         这个是代码这个callback（）到底什么意思啊前面也没有调用 在网上看了一下也是云里雾里 求大神讲

Answer 1

var checkCardID = (rule, value, callback) => {

        setTimeout(() => {            if(this.form.personIdInfoType === '20000'){                if (idCardNoUtil.checkIdCardNo(value)) {                    callback();
                } else {                    callback(new Error('请输入正确的身份证号码'));
                }
            }else{                callback();
            }
        }, 1);
        这个是代码这个callback（）到底什么意思啊前面也没有调用 在网上看了一下也是云里雾里 求大神讲