var retVal = confirm("Do you want to continue ?");if (retVal == true) { console.log("User wants to continue!"); return true;} else { console.log("User does not want to continue!"); return false;}
DOM Manipulation
// Adding elements// Appending stringsconst body = document.body;body.append("Hello World");// Appending divsconst div = document.createElement('div')body.append(div)div.innerText = "Hello World"// Render HTML inside a div// Note: Security problem if users enter textdiv.innerHTML = "<strong>Hi again</strong>"// Easy secure optionconst unsanitized_string = "abc <script>alert(1)<" + "/script> def";document.getElementById("target").setHTML(unsanitized_string);// Result (as a string): "abc def"// More secure version (from start)const body = document.bodyconst div = document.createElement(div)const strong = document.createElement(strong)div.append(strong)body.append(div)// Modify attributesconst spanHi = document.querySelector("#hi")spanHi.setAttribute("title", "hello there")// Modifying classesspanHi.classList.add("new-class")spanHi.classList.toggle("hidden", true)spanHi.style.backgroundColor = "red"