sunny123456

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javascript中的lambda表达式 find() filter() map()

javascript中的lambda表达式

复制代码
<!DOCTYPE html>
<html>
<head>
</head>
<body>
    <script>
        var nubList = [
                {
                    expressId: "00001", //快递单号ID
                    expressNum: "数据1"
                },
                {
                    expressId: "00002", //快递单号ID
                    expressNum: "数据2"
                },
                {
                    expressId: "00003", //快递单号ID
                    expressNum: "数据3"
                },
                {
                    expressId: "00004", //快递单号ID
                    expressNum: "数据4"
                }
            ];

        </span><span style="color: rgba(0, 0, 255, 1)">var</span> nub = nubList.find(nub =&gt; nub.expressId == <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">00002</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
        console.log(nub.expressId);
        
        </span><span style="color: rgba(0, 0, 255, 1)">var</span> nub1 = nubList.filter(nub =&gt; nub.expressId == <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">00002</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
        console.log(nub1[</span><span style="color: rgba(128, 0, 128, 1)">0</span><span style="color: rgba(0, 0, 0, 1)">].expressId);
</span>&lt;/script&gt;



</body>

</html>

复制代码

数据来自网上。

find和filter这两个的区别是：

find返回的是一条数据；

filter返回的是一个数组；

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posted on 2022-03-24 12:46  sunny123456  阅读(594)  评论(0)    收藏  举报