汉字，数字，字母正则

element input校验方法
<el-input
            v-model="input"
            @focus="onFcus"
            @input="handleClick"
            placeholder="请输入活动名称"
            id="errorInput"
            maxlength="20"
          ></el-input>


handleClick(value) {
      this.input = value.replace(/\s*/g, "");
      let nameRegx = /^[a-zA-Z0-9\u4e00-\u9fa5]+$/;
      if (!nameRegx.test(value) && value != "") {
        this.errorSpan = true;
        this.canSearch = false;
        document.getElementById("errorInput").style.border =
          "1px solid #F56C6C";
      } else {
        this.canSearch = true;
        this.errorSpan = false;
        document.getElementById("errorInput").style.border =
          "1px solid #DCDFE6";
      }
    },