var elementss2 = document.getElementsByClassName("contents"); //console.log(elementss2) for (var i = 0; i < elementss2.length; i++) { elementss2[i].style = "display: none;"; }
var elementss2 = document.getElementsByClassName("contents"); //console.log(elementss2) for (var i = 0; i < elementss2.length; i++) { elementss2[i].style = "display: none;"; }