获取尺寸。离子2中的contentTop属性值

当我点击时,我试图从我的页面顶部获得多少滚动值。

contentTop 返回的屏幕大小为662。 this.content.scrollHeight; 正在返回 1649

我正在尝试使用:

var isroll2 = this.content.getContentDimensions();
console.log(isroll2.dimensions.contentTop);

Official document here .

我如何得到我需要的?

home.ts

        ngAfterViewInit() {

            // Renderer2 used not Renderer, inject it before using
            this.renderer.listen('document', 'click', (e) => {

              var isroll2 = this.content.getContentDimensions();
        // error in below line of code
              console.log(isroll2.dimensions.contentTop);

    // if i use below code it always returns 0
    alert(isroll2.contentTop);

    //below code is giving me total height of my screen which is 662
          let element = this.content.getScrollElement();
          alert(element.clientHeight);

// below line is returning 1649, which is total content length
 var iscroll =  this.content.scrollHeight;
alert(iscroll);

        ...// code here