7、练习B

1、

                var str ="剧情,犯罪,月黑风高"
        /* 
        var  arr = [
            { name:"剧情"}
            ...
        ]
         */
        var arr = str.split(",");
        console.log(arr)
        var res = [];
        arr.forEach(name=>{
            console.log(name)
            res.push({
                name
            })
        })
        console.log(res)

2、

var obj = {
    top250: ["你好666", "他的666"],
    comingSoon: ["防抖111", "节流111"],
    theaters: ["放大镜222", "防静电222"]
}
/* 
var  arr = [
    {name:"你好"}
    ....
]
 */
/* 1、获取对象中属性的值 */
var arr = [];
for (var key in obj) {
    console.log(obj[key])
    /* 2、需要将属性的值整合到一个数组中去 */
    arr.push(...obj[key])
}
var res = [];
var reg = /\d/g
/* 3、对数组中每一项的值,过滤 */
arr.forEach(name => {
    var name = name.replace(reg, "");
    console.log(name)
    res.push({
        name
    })
})
console.log(res)

3、

var str = `<span>9.7<span><span>-248人评价</span><br>
        <span>9.5<span><span>-48人评价</span>
        <br><span>9.6<span><span>-508人评价</span>`;
/* 
arr = [
    {star:9.7,rating:248},
    {star:9.5,rating:48},
    {star:9.6,rating:508},
]
 */
/* 1、<br> */
var arr = str.split("<br>");
// console.log(arr)
/* 2、将数组中每一项的html标签去除  9.7-248人评价 */
var reg = /<[^<>]+>/g
var res = arr.map(item => {
    // console.log(item.trim().replace(reg,""))
    return item.trim().replace(reg, "")
})
// console.log(res)
/* 3、[[9.7,248]....] */
var list = [];
res.forEach(item => {
    // console.log(item.split("-"))
    list.push(item.split("-"))
})
var sum = [];
var rNum = /[^\d]/g;
list.forEach(item => {
    console.log(item)
    sum.push({
        star: item[0],
        rating: item[1].replace(rNum, "")
    })
})
console.log(sum)

4、

var str = `
        [{"name":"李四666","data":[2019,10,11]},
        {"name":"张三666","data":[2017,10,11]},
        {"name":"王五点击666","data":[2018,10,11]}]
        `
/* 
var arr = [
    {name:"李四...",data:"2019-10-11"}
    ...
]
 */
var arr = JSON.parse(str);
var list = [];
arr.forEach(item => {
    var {
        name,
        data
    } = item;
    name = name.replace(/\d/g, "") + "...";
    data = data.join("-")
    list.push({
        name,
        data
    })
})
console.log(list)

5、

var arr ={
    A:[{city:"武汉"},{city:"广州"}],
    B:[{city:"深圳"},{city:"广州"}],
    C:[{city:"上海"},{city:"武汉"}]
}
/* 
var citys  = ["武汉","广州","深圳","上海"]
 */
var list = [];
for(var key in arr){
    // console.log(arr[key])
    list.push(...arr[key]);
}
var res = [];
list.forEach(item=>{
    var {city}= item;
    console.log(item)
    if(!res.includes(city)){
        res.push(city);
    }
})
console.log(res)