How to apply block in small program development
Jun 12, 2018 am 10:14 AM這次給大家?guī)?lái)小程序開(kāi)發(fā)中怎樣應(yīng)用block,小程序開(kāi)發(fā)中使用block的注意事項(xiàng)有哪些,下面就是實(shí)戰(zhàn)案例,一起來(lái)看一下。
經(jīng)過(guò)一年的發(fā)展,微信小程序發(fā)展火熱,本期就介紹下小程序的一些使用。
在安卓中我們經(jīng)常會(huì)使用ListView/GradeView/RecyclerView來(lái)實(shí)現(xiàn)展示循環(huán)數(shù)據(jù)。那么小程序中怎么到呢。其實(shí)很簡(jiǎn)單,使用block就可以了。
下面我們先看下效果圖:
這個(gè)布局其實(shí)很簡(jiǎn)單,大致分為3部分,上+下(左75%,右25%)。這里就不在細(xì)說(shuō)了。那么這里要怎么寫wxml呢。下面貼代碼:
這邊很清晰的可以看出
下面順便介紹下數(shù)據(jù)格式處理(時(shí)間格式轉(zhuǎn)化):
在實(shí)際場(chǎng)景中我們可能會(huì)需要將時(shí)間轉(zhuǎn)化為幾分鐘前,幾小時(shí)前,幾天前等。那么我們數(shù)據(jù)庫(kù)中存放的一般是datetime格式數(shù)據(jù)。我們需要轉(zhuǎn)化處理。
處理時(shí)間的時(shí)候需要注意的是:ios和android上的時(shí)間格式不同。ios時(shí)間是以2018/04/01,所以需要先將時(shí)間格式轉(zhuǎn)化為/格式。不然你的小程序時(shí)間轉(zhuǎn)化只會(huì)對(duì)安卓生效哦。具體轉(zhuǎn)化代碼:
for?(var?i?=?0;?i?< goodsList.length; i++) { var PublishDatetime = goodsList[i].PublishDatetime.replace(/([\d\-]+)T(\d+:\d+)\:.*/, "$1 $2");//將帶T的時(shí)間格式轉(zhuǎn)化掉. PublishDatetime = PublishDatetime.replace(/-/g, "/");// 將格式‘-'轉(zhuǎn)化為‘/' //換算時(shí)間戳,計(jì)算得到與當(dāng)前時(shí)間的差距 var minute = 1000 * 60; var hour = minute * 60; var day = hour * 24; var halfamonth = day * 15; var month = day * 30; var now = new Date().getTime(); var diffValue = now - new Date(PublishDatetime).getTime(); //console.log("diffValue:" + diffValue); if (diffValue < 0) { return; } var monthC = diffValue / month; var weekC = diffValue / (7 * day); var dayC = diffValue / day; var hourC = diffValue / hour; var minC = diffValue / minute; if (monthC >=?1)?{ ???if?(monthC?<= 12) goodsList[i].PublishDatetime = "" + parseInt(monthC) + "月前";//將時(shí)間替換掉想要的數(shù)據(jù) else { goodsList[i].PublishDatetime = "" + parseInt(monthC / 12) + "年前";//將時(shí)間替換掉想要的數(shù)據(jù) } } else if (weekC >=?1)?{ ???goodsList[i].PublishDatetime?=?""?+?parseInt(weekC)?+?"周前";//將時(shí)間替換掉想要的數(shù)據(jù) ???} ???else?if?(dayC?>=?1)?{ ???goodsList[i].PublishDatetime?=?""?+?parseInt(dayC)?+?"天前";//將時(shí)間替換掉想要的數(shù)據(jù) ???} ???else?if?(hourC?>=?1)?{ ???goodsList[i].PublishDatetime?=?""?+?parseInt(hourC)?+?"小時(shí)前";//將時(shí)間替換掉想要的數(shù)據(jù) ???} ???else?if?(minC?>=?1)?{ ???goodsList[i].PublishDatetime?=?""?+?parseInt(minC)?+?"分鐘前";//將時(shí)間替換掉想要的數(shù)據(jù) ???}?else?{ ???goodsList[i].PublishDatetime?=?"剛剛";//將時(shí)間替換掉想要的數(shù)據(jù) ???} ??} ?//最后將轉(zhuǎn)化后的時(shí)間重新賦值給數(shù)據(jù)源
相信看了本文案例你已經(jīng)掌握了方法,更多精彩請(qǐng)關(guān)注php中文網(wǎng)其它相關(guān)文章!
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