<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>判断是不是数组</title>
</head>
<body>
<script>
var isArray = Function.isArray || function(o){
return typeof o === "object" && Object.prototype.toString.call(o) === '[object Array]';
}
var a = [1,3,45];
var b = {a:1,b:3};
console.log(isArray(a));//true
console.log(isArray(b));//false
</script>
</body>
</html>