在 beforeDestroyed 中把定時器取消掉：
原因是每次重繪后不是簡單的 resize而是重新實例化了一個組件，由於data的獨立性，新組件中的timer = null，而舊組件中的 timer始終存在，未被銷毀，而此時echarts實例已被銷毀，所以會有 echarts 實例已被銷毀的警告
Error-loading 改變重繪后，pie 組件輪播時會一直警告Instance ec_1623382451382 has been disposed
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