编辑代码

let target = '头皮环境与发质紧密相连。赋予**水润感，令精华成分充*吸收。使用感清爽舒适，***致，秀*呈现蓬松丰盈**弹力*' // 去重后找最后一个字
let st1 = '["净含量：1kc", "头皮环境与发质紧密相连赋子头皮水润感", "令精华成分充分吸收", "使用感清爽舒适", "秀发呈现蓬松羊盈感与弹力感", "·用指腹轻轻按摩头皮使其吸收，再涂抹头发部分井加以按摩", "以头皮为重点，将头皮与头发彻底冲洗干净。", "谨防入眼", "注意事项", "入眼请立即用清水或温水冲洗，使用", "时，请避免容器内入水，全请放置于婴幼儿接触不到的地方", "本品含水杨酸", "三岁以下儿童勿用。山奇基三甲基氯化铵", "作抗静电剂使用", "原产国，日本", "请于", "年", "月之前使用", "国妆网备进宝", "202001055", "正批请印装", "生产者名称及地址：株式", "一本国东京都中央区银座", "地址：中国", "558号10号楼", "请勿使", "若使用时出现红肿、", "成分：水·山梨（糖）醇", "命基三甲基氯化铵硬脂", "醇，双内甘醉、", "李铵盐一11樱花叶提耳", "提取物酒环提", "物秦椒果皮提取物滨海", "中", "赤芝提取物，刺梨果提取物", "醇丙醇水机", "酸、腺苷、乙醇、EDTA二钠", "、硅石、丁轻甲苯、苯甲", "酸钠、苯氧乙醇、香精", "30", "28+26", "专业美发使用", "4909978934408", "19"]'



// 获取最长子串
function LCS( str1 ,  str2 ) {
    // write code here
    let dp=[]
    let maxi,maxj
    let maxlen=0
    for(let i=0;i<str1.length+1;i++){
        dp[i]=[]
        for(let j=0;j<str2.length+1;j++){
            dp[i].push(0)
        }
    }
    for(let i=1;i<str1.length+1;i++){
        for(let j=1;j<str2.length+1;j++){
            if(str1[i-1]!=str2[j-1]){
                dp[i][j]=0
            }else{
                dp[i][j]=dp[i-1][j-1]+1;
                if(dp[i][j]>maxlen){
                    maxlen=dp[i][j]
                    maxi=i
                    maxj=j
                }
            }
        }
    }
    return str2.slice(maxj-maxlen,maxj)
    
}
// const re = getI(st1, target)
const re = LCS(st1, target)
console.log(re)

function getTextAear(source, target) {
    function searchSubStr(str,subStr){
        var positions = new Array();
        var pos = str.indexOf(subStr);
        while(pos>-1){
            positions.push(pos);
            pos = str.indexOf(subStr,pos+1);
        }
        return positions
    }
    const str_arr = Array.from(new Set(target.split('')))
    const posts = []
    str_arr.map(item => {
        let post_item = searchSubStr(source,item);
        if(post_item.length > 0) {
            posts.push(post_item)
        }
    })
    // console.log(posts)
    let total_a = []
    posts.map(item => {
        total_a.push(...item)
    })
    total_a.sort((a,b) => a-b)
    const set_a = new Set(total_a)
    const arr_s = Array.from(set_a)

    function fn(arr, step = 5){
        var result = [],
            i = 0;
        const list = arr.sort((a, b) => a-b);
        
        list.forEach((item, index) => {
            if (index === 0) {
            result[0] = [item];   
            } else if (item - list[index-1] <= step ) { // 判断当前值 和 前一个值是否相差1
            result[i].push(item);
            } else {
            result[++i] = [item]; // 开辟新空间。
            }
        })
        
        return result;
    }
    const step_a = fn(arr_s)
    console.log(step_a)
}
getTextAear(st1, target)
    console.log(st1.slice(32, 90))

// console.log(st1.slice(re.start, re.end+1))
// const { st, en } = getSpace(st1, target)
// console.log(st1.slice(st, en+1))
// let re2 = `[${target}]|.{0,${target.length}}`
// const re1 = new RegExp(re2)
// const result1 = st1.match(re1)
// console.log(result1)
// console.log(re1)