vue el-input中点击符号，文本框中显示符号

需求

点击 + | （ ）符号，页面中光标位置，展示对应的符号

点击完，光标留在原位

 代码

<el-form-item prop="kwspec" label='监测关键词'>
　　 <el-input type="textarea" placeholder="请输入监测关键词" ref="inputRef" @blur="inputBlur" v-model="ruleZyForm.kwspec" rows="6" clearable></el-input> 
</el-form-item> 

<el-form-item label="" prop=""> 
　　<ul class="formUl"> 
　　　　<li v-for="symbol, index in symbols" :key="index" @click="insertSymbol(symbol)">{{ symbol }}</li> 
　　</ul>
</el-form-item>

data:

      cursorPos: 0,
      symbols: ['+', '|', '(', ')'],

methods:

    inputBlur (e) {
      this.cursorPos = e.srcElement.selectionStart;
    },
    insertSymbol (symbol) {
      this.$nextTick(() => {
        const input = this.$refs.inputRef.$refs.textarea;
        if (input) {
          const value = this.ruleZyForm.kwspec;
          const leftPart = value.substring(0, this.cursorPos);
          const rightPart = value.substring(this.cursorPos);
          this.ruleZyForm.kwspec = `${leftPart}${symbol}${rightPart}`;
          this.cursorPos += symbol.length;
          input.value = this.ruleZyForm.kwspec
          input.focus();
          input.setSelectionRange(this.cursorPos, this.cursorPos);
        }
      });
    },