怎样让gulp监视文件变化自动执行

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var Asset = {
js: 'src/*.js',
less: 'dev/*.less',
static: [
'src/*.html',
'src/*.css',
'src/*.png',
'src/*.gif',
'src/*.json',
]
};
gulp.task('less', function () {
return gulp.src(Asset.less)
.pipe(less())
.pipe(header(banner, {
pkg: pkg
}))
.pipe(gulp.dest('src/'))
.pipe(cssmin())
.pipe(header(banner, {
pkg: pkg
}))
.pipe(gulp.dest('dist/'))
});
gulp.task('watch', ['less'], function () {
gulp.watch(Asset.less, ['less']);
});