docs: update first exec of debounce fn

epeejs · Apr 9, 2024 · 453be1d · 453be1d
1 parent ebfef48
commit 453be1d
Showing 1 changed file with 5 additions and 10 deletions.
diff --git a/docs/zjw/前端常见手写代码.md b/docs/zjw/前端常见手写代码.md
@@ -27,23 +27,18 @@ window.addEventListener('scroll', debounceTask);
 ```js
 function debounce(fn, delay) {
   var timer = null;
+  var first = true;
 
   return function () {
     clearTimeout(timer);
-
     const f = fn.bind(this, ...arguments);
-    const callNow = !timer;
 
-    if (callNow) {
+    if (first) {
       f();
+      first = false;
+    } else {
+      timer = setTimeout(f, delay);
     }
-    timer = setTimeout(() => {
-      timer = null;
-      // 非首次调用
-      if (!callNow) {
-        f();
-      }
-    }, delay);
   };
 }
 ```