换行

1.script中换行："<br>"

<script>
var x = 'It\'s alright';
var y = "He is called \"Johnny\"";
document.getElementById("demo").innerHTML = x + "<br>" + y; 
</script>

 

2.\n

function myFunction(){
var obj = document.getElementById("demo");
obj.innerHTML = "hello world";
alert("Hello\nHow are you?");
// document.getElementById("demo").innerText = "dnajncfalnc";
}