优化 JS 记载

@@ -116,10 +116,63 @@
         {{/wechatShare}}
         <script>var STATIC_RESOURCE_HASH = '{{startTime}}';</script>
         {{#if devEnv}}
-            <script>var STATIC_RESOURCE_PATH = '//{{devHost}}:{{port}}';</script>
+            <script>
+                var STATIC_RESOURCE_PATH = '//{{devHost}}:{{port}}';
+                window.jsFiles = ["//{{devHost}}:{{port}}/libs.js?t={{startTime}}", "//{{devHost}}:{{port}}/{{module}}.{{page}}.js?t={{startTime}}"];
+            </script>
 
-            <script src="//{{devHost}}:{{port}}/libs.js?t={{startTime}}"></script>
-            <script src="//{{devHost}}:{{port}}/{{module}}.{{page}}.js?t={{startTime}}"></script>
+            <script>
+                (function() {
+                    window.jsFiles.forEach(function(file) {
+                        var preloadLink = document.createElement('link');
+
+                        preloadLink.href = file;
+                        preloadLink.rel = 'preload';
+                        preloadLink.as = 'script';
+                        document.head.appendChild(preloadLink);
+                    });
+                    window.loadJS = function loadJS(src, retryMode) {
+                        var ref = window.document.getElementsByTagName('script')[ 0 ];
+                        var script = window.document.createElement('script');
+                        var scriptSrc;
+
+                        if (retryMode) {
+                            scriptSrc = src;
+                        } else {
+                            src && window.jsFiles.push(src);
+                            scriptSrc = window.jsFiles.shift();
+                        }
+
+                        if (!scriptSrc) {
+                            return;
+                        }
+
+                        script.src = scriptSrc;
+                        script.crossorigin = 'anonymous';
+
+                        if (!retryMode) {
+                            script.onerror = function() {
+                                if (script.parentNode) {
+                                    script.parentNode.removeChild(script);
+                                }
+
+                                loadJS(script.src, true);
+                            };
+                        }
+
+                        script.onload = function() {
+                            loadJS();
+                        };
+
+                        ref.parentNode.insertBefore(script, ref.nextSibling);
+                        return script;
+                    };
+
+                    loadJS();
+                }());
+            </script>
+            {{!-- <script src="//{{devHost}}:{{port}}/libs.js?t={{startTime}}"></script>
+            <script src="//{{devHost}}:{{port}}/{{module}}.{{page}}.js?t={{startTime}}"></script> --}}
         {{^}}
             <script>var STATIC_RESOURCE_PATH = '//cdn.yoho.cn/yohobuywap-node/{{version}}';</script>
             <script src="//cdn.yoho.cn/yohobuywap-node/{{version}}/libs.js?t={{startTime}}" crossorigin="anonymous"></script>