message: chore(Sticky): improve code
diff: @@ -36,7 +36,7 @@ exports[`should sticky inside container bottom when using container prop 1`] = `
  </div>
  <div style="height: 44px; width: 88px;">
  <div class="van-sticky van-sticky--fixed"
  - style="height: 44px; width: 88px; bottom: 0px;"
  + style="width: 88px; height: 44px; bottom: 0px;"
  >
  Content
  </div>
  @@ -50,7 +50,7 @@ exports[`should sticky inside container bottom when using container prop 2`] = `
  </div>
  <div style="height: 44px; width: 88px;">
  <div class="van-sticky van-sticky--fixed"
  - style="height: 44px; width: 88px; bottom: 0px; transform: translate3d(0, 24px, 0);"
  + style="width: 88px; height: 44px; bottom: 0px; transform: translate3d(0, 24px, 0);"
  >
  Content
  </div>
  @@ -62,7 +62,7 @@ exports[`should sticky inside container when using container prop 1`] = `
  <div style="height: 150px;">
  <div style="height: 44px; width: 88px;">
  <div class="van-sticky van-sticky--fixed"
  - style="height: 44px; width: 88px; top: 0px;"
  + style="width: 88px; height: 44px; top: 0px;"
  >
  Content
  </div>
  @@ -74,7 +74,7 @@ exports[`should sticky inside container when using container prop 2`] = `
  <div style="height: 150px;">
  <div style="height: 44px; width: 88px;">
  <div class="van-sticky van-sticky--fixed"
  - style="height: 44px; width: 88px; top: 0px; transform: translate3d(0, -14px, 0);"
  + style="width: 88px; height: 44px; top: 0px; transform: translate3d(0, -14px, 0);"
  >
  Content
  </div>
  @@ -105,7 +105,7 @@ exports[`should sticky to top after scrolling 1`] = `
  exports[`should update z-index when using z-index prop 1`] = `
  <div style="height: 10px;">
  <div class="van-sticky van-sticky--fixed"
  - style="top: 0px; z-index: 0;"
  + style="z-index: 0; top: 0px;"
  >
  Content
  </div>
  