前端代码

node_modules/engine.io-client/build/cjs/util.js

@@ -0,0 +1,65 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.pick = pick;
+exports.installTimerFunctions = installTimerFunctions;
+exports.byteLength = byteLength;
+exports.randomString = randomString;
+const globals_node_js_1 = require("./globals.node.js");
+function pick(obj, ...attr) {
+    return attr.reduce((acc, k) => {
+        if (obj.hasOwnProperty(k)) {
+            acc[k] = obj[k];
+        }
+        return acc;
+    }, {});
+}
+// Keep a reference to the real timeout functions so they can be used when overridden
+const NATIVE_SET_TIMEOUT = globals_node_js_1.globalThisShim.setTimeout;
+const NATIVE_CLEAR_TIMEOUT = globals_node_js_1.globalThisShim.clearTimeout;
+function installTimerFunctions(obj, opts) {
+    if (opts.useNativeTimers) {
+        obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globals_node_js_1.globalThisShim);
+        obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globals_node_js_1.globalThisShim);
+    }
+    else {
+        obj.setTimeoutFn = globals_node_js_1.globalThisShim.setTimeout.bind(globals_node_js_1.globalThisShim);
+        obj.clearTimeoutFn = globals_node_js_1.globalThisShim.clearTimeout.bind(globals_node_js_1.globalThisShim);
+    }
+}
+// base64 encoded buffers are about 33% bigger (https://en.wikipedia.org/wiki/Base64)
+const BASE64_OVERHEAD = 1.33;
+// we could also have used `new Blob([obj]).size`, but it isn't supported in IE9
+function byteLength(obj) {
+    if (typeof obj === "string") {
+        return utf8Length(obj);
+    }
+    // arraybuffer or blob
+    return Math.ceil((obj.byteLength || obj.size) * BASE64_OVERHEAD);
+}
+function utf8Length(str) {
+    let c = 0, length = 0;
+    for (let i = 0, l = str.length; i < l; i++) {
+        c = str.charCodeAt(i);
+        if (c < 0x80) {
+            length += 1;
+        }
+        else if (c < 0x800) {
+            length += 2;
+        }
+        else if (c < 0xd800 || c >= 0xe000) {
+            length += 3;
+        }
+        else {
+            i++;
+            length += 4;
+        }
+    }
+    return length;
+}
+/**
+ * Generates a random 8-characters string.
+ */
+function randomString() {
+    return (Date.now().toString(36).substring(3) +
+        Math.random().toString(36).substring(2, 5));
+}