perf: only patch string style when value has changed (#1310)

fix #1309
2020-06-12 05:25:39 +08:00
parent 1f2926a33c
commit d4e9b19932
2 changed files with 19 additions and 1 deletions
--- a/packages/runtime-dom/src/modules/style.ts
+++ b/packages/runtime-dom/src/modules/style.ts
@@ -8,7 +8,9 @@ export function patchStyle(el: Element, prev: Style, next: Style) {
  if (!next) {
    el.removeAttribute('style')
  } else if (isString(next)) {
-    style.cssText = next
+    if (prev !== next) {
+      style.cssText = next
+    }
  } else {
    for (const key in next) {
      setStyle(style, key, next[key] as string)