VUE 直接通过JS 修改html对象的值导致没有更新到数

Vue.ponent('rx-textarea', {
 props: {
  value:[String,Number],
  cols: {
   type: Number,
   default: 60
  },
  rows: {
   type: Number,
   default: 4
  }
 },
 data() {
  return {
   curVal:this.value
  }
 },
 template: "<div><textarea class='rx-textarea' v-model='curVal' @focus='focus(event)' :cols='cols' :rows='rows' @blur='change(event)' ></textarea></div>",
 methods:{
  change:function(e){
   this.$emit('input', e.target.value);
  },
  focus:function(e){
   this.$emit('myfocus', e);
  }
 },
 watch: {
  curVal: function (val, oldVal){
   this.$emit('input', this.curVal);
  },
  value :function(val,oldVal){
   if(val!=oldVal){
    this.curVal=this.value;
   }
  }
 }
})

<rx-textarea @myfocus="getTextarea" v-model="item.sql"></rx-textarea>

var curTextarea=null;
function getTextarea(e){
 curTextarea= e.target;
}

function insertPK(){
 $.insertText(curTextarea,"{pk}")
}