兼容elementUI低版本：文本域字数限制 吴小明

        <el-form-item label="申请理由">
          <el-input v-model="formData.applycontent"type="textarea":autosize="{ minRows:3, maxRows: 5}"placeholder="请输入申请理由":maxlength='200' />
          <spanclass="strLimit">{{strLimit}}/200</span>
        </el-form-item>

      strLimit: 0 //申请理由字数

watch: {
    'formData.applycontent': {
      handler(val) {
        this.strLimit =val.length
      },
      immediate: true}
  }

.el-form-item {.strLimit {position:absolute;right:10px;bottom:5px;line-height:1;color:#999;
        }}