Adjust SVG width and height

svg It is obtained from the back-end data , Get svg Then append it to wechat_qrcode Rendering in tags , Back end svg The width and height displayed are 207207 Do not conform to the UI280280, It is necessary to adjust its svg Wide and high

adjustment svg Width and height must be combined viewBox Use

<li id="wechat_qrcode" ref="wechat_qrcode"></li>
mounted(){
    
	this.fetchclientqrcode()
}
methods:{
    
	fetchclientqrcode() {
    
      return this.$http
        .get(`/api/qrcode`)
        .delegateTo(api_request)
        .then((res) => {
    
          this.$nextTick(() => {
    
            this.$refs.wechat_qrcode.innerHTML = res.qrcode;
            const svg = document.getElementsByClassName("pyqrcode")[0];
            svg.setAttribute("width","280");
            svg.setAttribute("height","280");
            svg.setAttribute("viewBox","0 0 210 210");
          });
        })
        .catch(({
     code, message }) => {
    
          throw ` Failed to get data ：${
     this.$t("api." + code)},  Additional information : ${
     this.$t( "api." + typeof message === "string" ? message : JSON.stringify(message) )}`;
        })
        .delegateTo(this.$snackbar.delegateError);
    }
}