Merge branch 'feature/installment1' into release/4.9.1.0

# Conflicts:
#	public/img/sprite.channel.png

@@ -45,7 +45,8 @@ const dist = {
 const postcssPlugin = (et) => {
     var sprites = {
             spritesmith: {
-                padding: 8
+                // 不能设置过小,否则有边缘会有问题
+                padding: 20
             },
             filterBy(file) {
                 // base64 的图片没有 url 过滤掉