本文介绍了如何计算已读为真的列表长度的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个列表
let chats: Chats[] = [
{id: 1, name: "James Anderson",read=false},
{id: 2, name: "James Anderson",read=true},
{id: 3, name: "James Anderson",read=true},
{id: 4, name: "James Anderson",read=true},
]
在 cshtml 页面上,我曾经以 {{chats.length}} 为正确返回所有计数,但我需要返回读取值设置为 false 的计数
and on cshtml page I used to right as {{chats.length}} which return all the count but I need to return the count whose read value is set as false
即我需要计数为 1 而不是 4
i.e I need the count as 1 instead of 4
推荐答案
可以使用array.filter和length如下,
You can use array.filter and length as follows,
let result = chats.filter(t=>!t.read).length;
演示
var chats = [
{id: 1, name: "James Anderson",read:false},
{id: 2, name: "James Anderson",read:true},
{id: 3, name: "James Anderson",read:true},
{id: 4, name: "James Anderson",read:true}
];
let result = chats.filter(t=>!t.read).length;
console.log(result);
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