<u-input
                :placeholder="'请输入金额'"
                border="none"
                v-model="value"
                @change="fastSearchInput()"
              ></u-input>
 methods: {
    fastSearchInput(e) {
      // this.$nextTick必要
      this.$nextTick(() => {
        value = e.replace(/\s\s+/g, ' '); // 多个空格保留一个空格
      })
    },
   }