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| name | setData 性能优化 |
| description | 检查并合并当前 JS 文件中的 setData 调用，提升渲染性能。 |
作为小程序性能优化专家，请检查选中的 JavaScript 代码中的 this.setData 调用。
执行以下优化：
setData 调用为一次。this.setData({ 'array[0].text': 'new' })），而不是重新 set 整个数组/对象。this._timer）。
请给出优化后的代码，并简要解释优化了哪些地方。