<!DOCTYPE html>
<html>
<body>
<button onclick="myFunction()">点击这里</button>
<p id="demo"></p>
<script>
function myFunction()
{
var x;
var txt="";
var person={fname:"dave",lname:"Gates",age:15};
for (x in person)
{
txt=txt + person[x];
}
document.getElementById("demo").innerHTML=txt;
}
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script>
var myArry =[1,2,3,4];
myArry.desc =‘four‘;
for(var value of myArry){
console.log(value)
}
document.write(myArry);
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html>
<head> <meta charset="UTF-8" />
<title>Document</title>
</head> <body>
<script>
var arr = [1,2,3,4,5];
arr.forEach(function(e)
{
document.write(e);
})
</script>
</body>
</html>
原文：https://www.cnblogs.com/ghostandgod/p/9941967.html