修改request，可自定contentType

src/core/request.js

@@ -20,12 +20,12 @@ function findRule(name) {
 }
 
 const request = async (args) => {
-    let rule = findRule(args.api || '');
+    const rule = findRule(args.api || '');
     if (JSON.stringify(rule) === "{}") {
         throw "找不到API：" + args.api;
     }
 
-    let query = (args.query) ? '?' + args.query : '';
+    const query = (args.query) ? '?' + args.query : '';
 
     if (typeof rule.auth !== "undefined" && rule.auth === true && !$store.state.user.token) {
         $store.commit("user/showLoginModal", true);
@@ -36,20 +36,18 @@ const request = async (args) => {
         title: "加载中"
     });
 
-    const headers = {
-        "XX-Wxapp-AppId": prototype.$config.appId,
-        'XX-Token': $store.state.user.token,
-        'XX-Device-Type': 'wxapp',
-    };
+    const contentType = (args.contentType) ? args.contentType : 'application/json';
 
     const [error, response] = await uni.request({
         url: prototype.$config.root + rule.url + query,
         method: rule.method || 'post',
         data: args.data,
         header: {
+            "XX-Wxapp-AppId": prototype.$config.appId,
+            'XX-Token': $store.state.user.token,
+            'XX-Device-Type': 'wxapp',
             'X-Requested-With': 'XMLHttpRequest',
-            'content-type': 'application/x-www-form-urlencoded',
-            ...headers
+            'content-type': contentType,
         }
     });