https://stackoverflow.com/questions/58589741/angular-8-hide-divs-and-show-div-on-button-click
div1:boolean=true;
div2:boolean=true;
div3:boolean=true;
div1Function(){
this.div1=true;
this.div2=false;
this.div3=false
}
div2Function(){
this.div2=true;
this.div1=false;
this.div3=false
}
div3Function(){
this.div3=true;
this.div2=false;
this.div1=false
}