Base64如何切割后面的内容,如何提取data:image/png；base64,之后的内容，Vue中.split中截取的数组如何使用数组进行获取

<template>
  <h2>复制或剪切图片后以ctrl + V 粘贴</h2>
   <img id="img" src="" alt="">
</template>
 
<script>
export default {
  methods: {
    setPasteImg(){
            //粘贴事件
            document.addEventListener('paste', function(event){
                if (event.clipboardData || event.originalEvent) {
                    var clipboardData = (event.clipboardData || event.originalEvent.clipboardData);
                    if(clipboardData.items){
                        var  blob;
                        for (var i = 0; i < clipboardData.items.length; i++) {
                            if (clipboardData.items[i].type.indexOf("image") !== -1) {
                                blob = clipboardData.items[i].getAsFile();
                            }
                        }
                        var render = new FileReader();
                        render.onload = function (evt) {
                            //输出base64编码
                            var base64 = evt.target.result;
                            // console.log(base64);
                            // arr = base64.split(',');
                            // console.log(base64);
                            console.log(base64.split(','));
                            var imgArr = [];
                            imgArr = base64.split(',')
                            console.log(imgArr[0]);
                            console.log(imgArr[1])
                            // var imgArr = [];
                            // imgArr = base64.split(',')
                            // console.log(imgArr[0]);
                            // console.log(array[0]);
                            document.getElementById('img').setAttribute('src',base64);
                        }
                        render.readAsDataURL(blob);
                    }
 
                }
 
            })
        }
  },
  mounted(){
    this.setPasteImg()
  }
}
</script>
 
<style>
      #img{
            width: 800px;
            box-shadow: 0 0 5px blue;
        }
</style>