hexo-lazyload-image-modified/lib/addscripts.js

a hexo plugin which is used to have all images support lazyload, with the help of this functionality, it will improve lots of the loading proformance.

const fs = require('hexo-fs');
const lazyLoadPath = __dirname + '/simple-lazyload.js';

module.exports.addScript = function(htmlContent){
    let injectExtraScript = function () {
        if (!fs.exists(lazyLoadPath)) throw new TypeError(lazyLoadPath + ' not found!');
        let lazyLoadSourceCode = fs.readFileSync(lazyLoadPath, { escape: true });
        return '<script>' + lazyLoadSourceCode + '</script>';
    };
    if (/<\/body>/gi.test(htmlContent)) {
        let lastIndex = htmlContent.lastIndexOf('</body>');
        htmlContent = htmlContent.substring(0, lastIndex) + injectExtraScript() + htmlContent.substring(lastIndex, htmlContent.length);
    }
    return htmlContent;
};