初始化fy

uni_modules/UniDevTools/node_modules/licia/prefetch.js

@@ -0,0 +1,26 @@
+function prefetchByLink(url) {
+    return new Promise(function(resolve, reject) {
+        var link = document.createElement('link');
+        link.rel = 'prefetch';
+        link.href = url;
+        link.onload = resolve;
+        link.onerror = reject;
+        document.head.appendChild(link);
+    });
+}
+function prefetchByXhr(url) {
+    return new Promise(function(resolve, reject) {
+        var req = new XMLHttpRequest();
+        req.open('GET', url, (req.withCredentials = true));
+        req.onload = function() {
+            req.status === 200 ? resolve() : reject();
+        };
+        req.send();
+    });
+}
+var link = document.createElement('link');
+var supportLink =
+    (link.relList || {}).supports && link.relList.supports('prefetch');
+exports = supportLink ? prefetchByLink : prefetchByXhr;
+
+module.exports = exports;