【div】
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){
var numbers = document.getElementById("myDiv").innerHTML.split(" <br> ");
var length = numbers.length;
var sum = 0;
for(var i = 0; i < length; i++){
sum += parseInt(numbers[i]);
}
console.log(sum);
}
</script>
</head>
<body>
<div id="myDiv">
1 <br /> 2 <br /> 3 <br /> 4
</div>
</body>
</html>
