<!doctype html>
<html lang="en">
<head>
<title>test</title>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<style>
</style>
</head>
<body>
<script>
function Range(m,n){
if(isNaN(m/n)){return false}
this.min = Math.min(m,n);
this.max = Math.max(m,n);
}
Range.prototype = {
includes:function(x){return x>this.min && x<this.max},
foreach:function(fn){for(var i=this.min;i<this.max;i++){fn(i)}},
toString:function(){return ""+this.min+this.max}
}
var range = new Range(10,3);
range.includes(12);
range.foreach(alert); //为什么把alert换成console.log就会报错呢(uncaught typeError:illegal invocation)?
range.toString();
</script>
</body>
</html>