ionic4 修改公衆號標題

setBrowsTitle(title) {
    //修改瀏覽器的標題
    var body = document.getElementsByTagName("body")[0];
    document.title = title;
    var iframe = document.createElement("iframe");
    iframe.setAttribute("src", "assets/shapes.svg");
    iframe.setAttribute("style", "display:none");
    iframe.addEventListener("load", function() {
      setTimeout(function() {
        try {
          iframe.removeEventListener("load", msg => {});
        } catch (err) {}
        document.body.removeChild(iframe);
      }, 0);
    });
    document.body.appendChild(iframe);
  }

ionViewWillEnter(){
    this.setBrowsTitle("申請信息填寫");
  }