使用gulp-uglify壓縮js代碼，壓縮后代碼丟失怎么解決？壓縮前：window.onload = function(){  var c = a + b;  console.log( c );  function aa () {    console.log(123);  }};壓縮后：window.onload=function(){var o=a+b;console.log(o)};gulpfile.jsvar gulp = require('gulp');var uglify = require('gulp-uglify');var pump = require('pump');gulp.task('compress', function (cb) {  pump([        gulp.src('src/*.js'),        uglify(),        gulp.dest('output/minJs')    ],    cb  );});不知道問題出在哪里？