写webpack插件

function Statistics(options) {
    this.options = options;
}

Statistics.prototype.code = function(){
    return 'code'
}
    
Statistics.prototype.apply = function(compiler) {
    var _this = this;
    compiler.plugin('compilation', function(compilation) {
        compilation.plugin('html-webpack-plugin-after-html-processing', function(htmlPluginData) {
            htmlPluginData.html = htmlPluginData.html.replace('</body>', `${_this.code()}</body>`)
        });
    });
};

module.exports = {
    Statistics
};