Javascript-如何获取filter（）返回匹配结果

Question

我需要将match的结果返回给filter 。 我尝试了forEach但是由于某种我似乎无法解决的原因，它导致脚本崩溃而没有错误。 如果在filter我记录了element.match(/regex/)[1]它记录了我想要的输出。 但是，当我返回该字符串时，它将返回整个字符串（而不仅仅是匹配项）。 这是代码：

let myAr = ['{"engagement":{"eng_type":"1","eng_src":"2","eng_tid":"100000077777226","eng_data":[]},"coeff2_registry_key":"0406","coeff2_info":"AauUajLpeWuhLBG3jk4ypnhABBcEcbN4M8Z2F6J_CQaQXEhPwL-3j1_dX5vhAleK3K7rjlzqJwnG4xGGaGdFk7Eb","coeff2_action":"1","coeff2_pv_signature":"1509941759"}',
        '{"engagement":{"eng_type":"1","eng_src":"2","eng_tid":"711427743","eng_data":[]},"coeff2_registry_key":"0406","coeff2_info":"AasHfdsp_Gkdbs3_B4K-_5cN8Y0ZqJPVdm4MYXBzUoXs5QyNoPir8LEYK_RsMpQMxwI","coeff2_action":"1","coeff2_pv_signature":"1509941759"}',
        '{"engagement":{"eng_type":"1","eng_src":"2","eng_tid":"500890765","eng_data":[]},"coeff2_registry_key":"0406","coeff2_info":"AasBuRKr2vnMecj6ozdELAcZnUPL1FD3ojLSVrYrTckKy_pB2HekM693oJwKD0yH41Y","coeff2_action":"1","coeff2_pv_signature":"1509941759"}',
        ];

let resultAr = myAr.filter(function(element) {
        if (element != '#' && element != null) {
            console.log( element.match(/eng_tid":"(\d*)",/)[1]); // this logs what I want
            return element.match(/eng_tid":"(\d*)",/)[1]; // this doesn't return what I want
        } else {
            return false;
        }
    });
console.log(resultAr);

如何返回第一个控制台记录器中的输出？

Answer 1

您应该使用“地图”，而不是“过滤器”。

let myAr = ['{"engagement":{"eng_type":"1","eng_src":"2","eng_tid":"100000077777226","eng_data":[]},"coeff2_registry_key":"0406","coeff2_info":"AauUajLpeWuhLBG3jk4ypnhABBcEcbN4M8Z2F6J_CQaQXEhPwL-3j1_dX5vhAleK3K7rjlzqJwnG4xGGaGdFk7Eb","coeff2_action":"1","coeff2_pv_signature":"1509941759"}',
    '{"engagement":{"eng_type":"1","eng_src":"2","eng_tid":"711427743","eng_data":[]},"coeff2_registry_key":"0406","coeff2_info":"AasHfdsp_Gkdbs3_B4K-_5cN8Y0ZqJPVdm4MYXBzUoXs5QyNoPir8LEYK_RsMpQMxwI","coeff2_action":"1","coeff2_pv_signature":"1509941759"}',
    '{"engagement":{"eng_type":"1","eng_src":"2","eng_tid":"500890765","eng_data":[]},"coeff2_registry_key":"0406","coeff2_info":"AasBuRKr2vnMecj6ozdELAcZnUPL1FD3ojLSVrYrTckKy_pB2HekM693oJwKD0yH41Y","coeff2_action":"1","coeff2_pv_signature":"1509941759"}',
    ];

let resultAr = myAr.map(function(element) {
    if (element != '#' && element != null) {
        return element.match(/eng_tid":"(\d*)",/)[1];
    } else {
        return false;
    }
});
console.log(resultAr);