本文实例讲述了JavaScript数据库TaffyDB用法。分享给大家供大家参考。具体如下：
TaffyDB 是一个免费开源的 JavaScript 库，用于在 Web 上实现一个轻量级的数据访问层，也就是一个简单的数据库。
数据定义：
var friends = new TAFFY(
[
{name:"Bob",
gender:"M",
married:"No",
age:25,
state:"NY",
favorite_foods:["pizza","tacos"]},
{name:"Joyce",
gender:"F",
married:"No",
age:29,
state:"WA",
favorite_foods:["salad","cheese sticks"]},
{name:"Dan",
gender:"M",
married:"No",
age:29,
state:"MT",
favorite_foods:["pizza","hamburgers","BLTs"]},
{name:"Sarah",
gender:"F",
married:"No",
age:21,
state:"ID",
favorite_foods:["pizza","sushi"]}
]
)
查询：
friends.find({age:{greaterthan:22}});
friends.find({state:["WA","MT","ID"]});
friends.find({state:["WA","MT","ID"],
age:{greaterthan:22}});
更新操作：
friends.update(
{
state:"CA",
married:"Yes"
},
{
name:"Joyce"
}
);
friends.update({state:"CA",married:"Yes"},1);
friends.update(
{
state:"CA",
married:"Yes"
},
friends.find(
{name:"Joyce"}
)
);
插入数据：
//Inserting is simple and works as you would expect:
friends.insert(
{name:"Brian",
gender:"M",
married:"No",
age:52,
state:"FL",
favorite_foods:["fruit","steak"]
});
删除：
复制代码 代码如下:friends.remove({name:"Brian"});
排序：
friends.orderBy(["age",{"name":"desc"}]);
var keys = new TAFFY([
{name:"12abc"},
{name:"abc343"},
{name:"1abc"},
{name:"23abc"}
]);
keys.orderBy({name:"logical"});
forEach用法：
friends.forEach(function (f,n) {alert(f.name)});
friends.forEach(
function (f,n) {alert(f.name);},
{favorite_foods:{has:"pizza"}}
);
希望本文所述对大家的javascript程序设计有所帮助。
免责声明：本站文章均来自网站采集或用户投稿，网站不提供任何软件下载或自行开发的软件！
如有用户或公司发现本站内容信息存在侵权行为，请邮件告知！ 858582#qq.com
桃源资源网 Design By www.nqtax.com
暂无“JavaScript数据库TaffyDB用法实例分析”评论...
P70系列延期，华为新旗舰将在下月发布
3月20日消息，近期博主@数码闲聊站 透露，原定三月份发布的华为新旗舰P70系列延期发布，预计4月份上市。
而博主@定焦数码 爆料，华为的P70系列在定位上已经超过了Mate60，成为了重要的旗舰系列之一。它肩负着重返影像领域顶尖的使命。那么这次P70会带来哪些令人惊艳的创新呢？
根据目前爆料的消息来看，华为P70系列将推出三个版本，其中P70和P70 Pro采用了三角形的摄像头模组设计，而P70 Art则采用了与上一代P60 Art相似的不规则形状设计。这样的外观是否好看见仁见智，但辨识度绝对拉满。