修复u-number-box删除最后一位数字后 再次focus再次删除时值为空的问题 导致和v-model值不一致的问题 #1115
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修复手动删除最后一位数字后,input内值为空,但是实际v-model有值的bug。在blur事件内将值修改为最小值。触发onchange事件