在微信小程序中循环遍历时怎么让索引加1

第一步，把要改变样式添加到相应js文件的全局变量中，如： data : { color : '#000' } 第二步，将变量绑定到view中,如： 第三步，在view中添加事件，如： bindtap="changeColor" 第四步，在相应js文件中添加该自定义方法： , changeColor: funct

讲解下循环输出元素

这里写描述

这里写描述

后台存储的数据给事

{

var local_database = [

{

date: "Sep 18 2016",

post_title:"冬日校花",

post_image: "/images/1jpg",

text: "美呀，美呀",

view_num: 112,

collect_num: 96,

turn_num: 515,

author_img: "/images/6jpg",

author:"高晴",

dateTime:"24小时",

detail:"我爱你，爱的如此深沉",

postId:0,

music:{

url: 'down/46993mp3',

title: "雪の华-南条爱乃",

coverImg: "/music/photo_new/T002R150x150M000001TEc6V0kjpVCjpgmax_age=2592000"

},

},

{

date: "Sep 18 2016",

post_title: "冬日校花",

post_image: "/images/2jpg",

text: "美呀，美呀",

view_num: 112,

collect_num: 96,

turn_num: 515,

author_img: "/images/6jpg",

author: "高晴",

dateTime: "24小时",

detail: "我爱你，爱的如此深沉",

postId: 1,

music: {

url: '/yq/5092537mp3',

title: "爱你-陈芳语",

coverImg: "/music/photo_new/T002R150x150M000001TEc6V0kjpVCjpgmax_age=2592000"

},

},

{

date: "Sep 18 2016",

post_title: "冬日校花",

post_image: "/images/3jpg",

text: "美呀，美呀",

view_num: 112,

collect_num: 96,

turn_num: 515,

author_img: "/images/6jpg",

author: "高晴",

dateTime: "24小时",

detail: "我爱你，爱的如此深沉",

postId: 2,

music: {

url: '/yq/204586755mp3',

title: "云烟成雨-房东的猫",

coverImg: "music/photo_new/T002R150x150M000001TEc6V0kjpVCjpgmax_age=2592000"

},

},

{

date: "Sep 18 2016",

post_title: "冬日校花",

post_image: "/images/4jpg",

text: "美呀，美呀",

view_num: 112,

collect_num: 96,

turn_num: 515,

author_img: "/images/6jpg",

author: "高晴",

dateTime: "24小时",

detail: "我爱你，爱的如此深沉",

postId: 3,

music: {

url: '/yq/213919334mp3',

title: "Your Song-Lady Gaga",

coverImg: ">

Page({

    data: {

        imgI：0

    }

}）

loadImg(){

        let that=this,image=thatdatalistimg,i=thatdataimgI;

        for(i;i<imagelength;i++){

            wxdownloadFile({

                url: thatdataurl+image[i],

                success (res) {

                    if (resstatusCode === 200) {

                        wxsaveImageToPhotosAlbum({

                            filePath: restempFilePath,

                            success(res){

                                if (i==imagelength) {

                                    wxshowToast({

                                        title: '保存成功',

                                    })

                                } else {

                                    thatsetData({

                                        imgI:i+1

                                    })

                                    thatloadImg()

                                }

                            }

                        })

                    }

                }

            })

        }

    },

function getData()

{

return new Promise((resolve, reject)=>{

var arr = [];

var i=0,len = 3;

for(;i<len;i++)

{

//通过 request 向后台发送请求,把数据添加到 arr 数组里面，当长度相同时执行回调函数

request()then(res=>{

arrpush(res);

if(arrlength === len)resolve(arr);

})

}

});

}

getData()then(res=>{

consolelog(res);

})catch(res=>{

consolelog(res);

})

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