<script src="kaishixuexi.js"></script> This is a catchy way
<script >
var a="big tree";
var b=11;
var c=5;
var d="girlfriend";
var e="green";
// alert("I am a "+a+", which grows a "+b+" branch. I have a "+d+", and in autumn it will be "+e+"")
document.write("I am a "+a+", which grows a "+b+" branch. I have a "+d+", and in autumn it will be "+e+"")
</script>
Addition, subtraction, multiplication and division algorithms
<script>
var a=9;
var b=4;
document.write("a:"+(a+b)+"<br>");
document.write(+(a-b)+"<br>");
document.write("a*b"+(a*b)+"<br>")
document.write("a/b="+(a/b)+"<br>");
document.write("a+b-b*b/b="+(a+b-b*b/b)+"")
document.write("a+b="+(a+b)+"");
</script>