问Gulp:输出到dest文件夹时排除src根文件夹

EN

var del = require('del');
var gulp = require('gulp');
var jshint = require('gulp-jshint');
var livereload = require('gulp-livereload');
var notify = require('gulp-notify');
var sourcemaps = require('gulp-sourcemaps');
var transpile  = require('gulp-es6-module-transpiler');

gulp.task('build', function() {
    return gulp.src('src/js/**/*.js')
        .pipe(sourcemaps.init())
        .pipe(transpile({
            formatter: 'bundle'
        }))
        .pipe(sourcemaps.write('./'))
        .pipe(gulp.dest('dist'))
        .pipe(notify({ message: 'Build task complete.' })); });