一、配置
gulp的雪碧图功能没有grunt那么强大，但是类似功能也支持，功能稍微弱一些，但是也很棒
npm地址：https://www.npmjs.com/package/gulp-css-spriter/ https://www.npmjs.com/package/grunt-css-sprite
vargulp=require('gulp'),
minifyCSS=require('gulp-minify-css'),
spriter=require('gulp-css-spriter');
二、gulp
gulp.task('css', function(){
var timestamp = +new Date();
return gulp.src(srcPath.css)
.pipe(spriter({
// 生成的spriter的位置
'spriteSheet': './web/images/sprite_'+timestamp+'.png',
// 生成样式文件图片引用地址的路径
// 如下将生产：backgound:url(../images/sprite20324232.png)
'pathToSpriteSheetFromCSS': '../images/sprite_'+timestamp+'.png'
}))
.pipe(minifyCss())
.pipe(autoprefixer({
browsers:['last 2 Chrome versions', 'Safari >0', 'Explorer >0', 'Edge >0', 'Opera >0', 'Firefox >=20'],
cascade:false,
remove:false,
}))
.pipe(gulp.dest(distPath.css));//保存压缩文件到指定的目录下面
});
三、css
.w{width: 266px;height: 78px;background: url(../images/w.png?__spriter) 0 0 no-repeat;}
.j{width: 270px;height: 60px;background: url(../images/jd.png?__spriter) 0 0 no-repeat;}
.t{width: 290px;height: 100px;background: url(../images/tmall.png) 0 0 no-repeat;}
四、配置
gulp-css-spriter默认会对样式文件里，所有的background/background-image的图片合并，
但实际项目中，我们不是所有的图片都需要合并。
background-image:url(../slice/p1-3.png?__spriter);//有?__spriter后缀的合并
background-image:url(../slice/p-cao1.png);//不合并
修改下面文件可以按需合并。
node_modules\gulp-css-spriter\lib\map-over-styles-and-transform-background-image-declarations.js
48行开始的if-else if代码块中， // background-image always has a url
// background-image always has a url
if(transformedDeclaration.property === 'background-image') {
return cb(transformedDeclaration, declarationIndex, declarations);
}
// Background is a shorthand property so make sure `url()` is in there
else if(transformedDeclaration.property === 'background') {
var hasImageValue = spriterUtil.backgroundURLRegex.test(transformedDeclaration.value); if(hasImageValue) {
return cb(transformedDeclaration, declarationIndex, declarations);
}
}
替换为下面代码：
//background-imagealwayshasaurl且判断url是否有?__bg 后缀
if(transformedDeclaration.property === 'background-image'&&/\?__bg/i.test(transformedDeclaration.value)){
transformedDeclaration.value = transformedDeclaration.value.replace('?__bg','');
return cb(transformedDeclaration,declarationIndex,declarations);
}
//Backgroundisashorthandpropertysomakesure`url()`isinthere且判断url是否有?__bg 后缀
else if(transformedDeclaration.property === 'background'&&/\?__bg/i.test(transformedDeclaration.value)){
transformedDeclaration.value = transformedDeclaration.value.replace('?__bg','');
var hasImageValue = spriterUtil.backgroundURLRegex.test(transformedDeclaration.value);
if(hasImageValue){
return cb(transformedDeclaration,declarationIndex,declarations);
}
}
完整图片
没有添加?__spriter不会合并
五、增强
function SpriterGroup(pathArr){
for(let i = 0; i < pathArr.length; i++){
gulp.src(pathArr[i]).pipe(spriter({
'spriteSheet' : './dist/images/spriteSheet_' + i +'.png',
'pathToSpriteSheetFormCss' : '../images/spriteSheet_' + i + '.png'
})).pipe(gulp.dest('.dist/css'));)
}
}
gulp.task('spirter', function(){
spriterGroup([ 'a.css', 'b.css'])
})
var gulp = require('gulp');
var spriter = require('gulp-css-spriter');
gulp.task('css',function {
return gulp.src('a.css').pipe(spriter({
'spriteSheet' : './dist/images/spriteSheet_a.png',
'pathToSpriteSheetFormCss' : '../images/spriteSheet_a.png'
})).pipe(gulp.dest('.dist/css'));
});
gulp.task('css',function {
return gulp.src('b.css').pipe(spriter({
'spriteSheet' : './dist/images/spriteSheet_b.png',
'pathToSpriteSheetFormCss' : '../images/spriteSheet_b.png'
})).pipe(gulp.dest('.dist/css'));
});