javascript 网页正文提取

写这个的原因，最近在改一个网页正文提取的插件，但找遍了网站就是没有JS版的，于是乎就找了个Java版的代码。进行了修改。

经测试 可用；

代码自取；

let content = getArticleContent($('body').html());

/**         * 摘取文章主体正文算法         * @param body         * @returns {正文}         */        let getArticleContent = function (body) {            /**             * 行分块的大小(块大小=BLOCKS+1)             */            let BLOCKS = 0;            /**             * 判断为正文的文字骤变率             */            let CHANGE_RATE = 0.9;            /**             * 每行最小长度             */            let MIN_LENGTH = 3;            let html = body;            /**             * 去除html标签             * @param html 请求获得的html文本             * @return 纯文本             */            let deleteLabel = function (html) {                let regEx_script = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/g; // 定义script的正则表达式                let regEx_style = /<stype\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/stype>/g; // 定义style的正则表达式                let regEx_html = /<(?:.|\s)*?>/g; // 定义HTML标签的正则表达式                html = html.replace(regEx_script, "");                html = html.replace(regEx_style, "");                html = html.replace(regEx_html, "");                html = html.replace("((\r\n)|\n)[\\s\t ]*(\\1)+", "$1").replace("^((\r\n)|\n)", "");//去除空白行                html = html.replace("    +| +|　+", ""); //去除空白                return html.trim();            };            let b_html = deleteLabel(html);            /**             * 将纯文本按BLOCKS分块             * @param text 纯文本             * @return 分块后的map集合,键即为块号,值为块内容             */            let splitBlock = function (text) {                let groupMap = new Array();                let bais = text;                let br = text.split('\n');                let line = null,                    blocksLine = "";                let theCount = 0,                    groupCount = 0,                    count = 0;//1.记录每次添加的行数；2.记录块号；3.记录总行数                for (let i = 0; i < br.length; i++) {                    line = br[i];                    if (line != '') {                        if (line.length > MIN_LENGTH) {                            if (theCount <= BLOCKS) {                                blocksLine += line.trim();                                theCount++;                            }                            else {                                if (blocksLine != undefined) {                                    groupMap[groupCount] = blocksLine;                                    groupCount++;                                    blocksLine = line.trim();                                    theCount = 1;                                }                            }                            count++;                        }                    }                }                if (theCount != 0 && blocksLine != undefined) {//加上没凑齐的给给定块数的                    groupMap[groupCount + 1] = blocksLine;                }                return groupMap;            };            let o_html = splitBlock(b_html);            /**             * 分析每块之间变化的情况             * @param map 块集合             * @return 正文             */            let judgeBlocks = function (map) {                let sets = map;                let contentBlock = [];                let currentBlock = map.length; //当前行的长度                let lastBlock = 0; //上一行的长度                for (let i = 0; i < sets.length; i++) {                    if (sets[i] != undefined) {                        lastBlock = currentBlock;                        currentBlock = sets[i].length;                        let between = Math.abs(currentBlock - lastBlock) / Math.max(currentBlock, lastBlock);                        if (between >= CHANGE_RATE) {                            contentBlock.push(i);                        }                    }                }                //下面是取多个峰值节点中两个节点之间内容长度最大的内容                let matchNode = contentBlock.length;                let lastContent = 0;//前一个两节点之间的内容长度                let context = null;//结果                if (matchNode > 2) {                    for (let i = 1; i < matchNode; i++) {                        let result = "";                        for (let j = contentBlock[i - 1]; j < contentBlock[i]; j++) {                            result += map[j];                        }                        if (result.length > lastContent) {                            lastContent = result.length;                            context += result;                        }                    }                }                return context;            };            let articleContent = judgeBlocks(o_html);            return articleContent;        };