vant-weapp:使用Filed組件時，當輸入內容發生改變得時候觸發函數

<van-cell-group> <van-field class="pictureDefine-input" :value="pictureDefinePrice" placeholder="請輸入價格" :border="true" @change="myChange"/> <span class="pictureDefine-tip fs4">次</span> </van-cell-

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