an class="token plain">      val </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> newVal</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">      </span><span class="token comment" style="color:#999988;font-style:italic">// 每次更新数据之后广播更新</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">      dep</span><span class="token punctuatio