修复stypeMap传值为0的bug

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@bd/core",
-  "version": "1.8.5",
+  "version": "1.8.6",
   "type": "module",
   "description": "百搭UI组件库的核心",
   "main": "dist/index.js",

src/index.js

@@ -35,9 +35,7 @@ export function classMap(data = {}) {
 export function styleMap(data = {}) {
   let output = ''
   for (let k in data) {
-    if (data[k]) {
-      output += hyphen(k) + ':' + data[k] + ';'
-    }
+    output += hyphen(k) + ':' + data[k] + ';'
   }
   return output
 }