go top

qtan · qtan · commit 52fe12f20f8b · 2017-05-10T15:46:34.000-06:00
diff --git a/gotop_fromYangJi.js b/gotop_fromYangJi.js
@@ -0,0 +1,30 @@
+function goTop(acc, t) {
+    const acceleration = acc || 0.1;
+    const time = t || 16;
+
+    const document = window.document;
+
+    let x1, y1, x2, y2 = 0;
+    if (document.documentElement) {
+        x1 = document.documentElement.scrollLeft || 0;
+        y1 = document.documentElement.scrollTop || 0;
+    }
+    if (document.body) {
+        x2 = document.documentElement.scrollLeft || 0;
+        y1 = document.documentElement.scrollTop || 0;
+    }
+    const x3 = window.scrollX || 0;
+    const y3 = window.scrollY || 0;
+    //&#28378;&#21160;&#26465;&#21040;&#39029;&#38754;&#39030;&#37096;&#30340;&#27700;&#24179;&#36317;&#31163;
+    const x = Math.max(x1, Math.max(x2, x3));
+    //&#28378;&#21160;&#26465;&#21040;&#39029;&#38754;&#39030;&#37096;&#30340;&#22402;&#30452;&#36317;&#31163;
+    const y = Math.max(y1, Math.max(y2, y3));
+    const speed = 1 + acceleration;
+    //&#28378;&#21160;&#36317;&#31163;= &#30446;&#21069;&#36317;&#31163;&#65295;&#36895;&#24230; &#28378;&#21160;&#36317;&#31163;&#20250;&#36234;&#26469;&#36234;&#23567;&#65288;&#36895;&#24230;>1&#65289;
+    window.scrollTo(Math.floor(x / speed), Math.floor(y / speed));
+    //&#22914;&#26524;&#36317;&#31163;&#19981;&#20026;&#38646; &#32487;&#32493;&#35843;&#29992;&#36845;&#20195;&#26412;&#20989;&#25968;
+    if (x > 0 || y > 0) {
+        window.setTimeout(goTop, time);
+    }
+    return;
+}
