: uni.postMessage is not a function

<script type="text/javascript" src="../../static/hybrid_html_uni.webview.1.5.5"></script>
<script>
export default {
data() {
return {
eventData:['44','33','22'],
selIndex:0,
}
},
onLoad() {

      },  
      methods: {  
          userCliclShare(item,index){  
              console.log('item===========',index);  
              uni.postMessage({    
                  data: {    
                      type: '__JSBridge',    
                      action: 'chooseImage',    
                      callBackFn: 'chooseImageCallBack',    
                  },    
              });   

          },  
 }  

</script>