想知道是哪里出问题了？

来源：6-7 编程练习

Dreams乄深巷

2021-02-21 15:04:01

<!DOCTYPE html> 
<html> 
<head> 
    <meta charset="UTF-8" /> 
    <title> arguments</title> 
</head> 
<body> 
   <p id="test" style="background-color: red; color: blue;">我是一个段落！</p>
<script type="text/javascript"> 
// 在此处补充代码
var test=document.getElementById("test");
function css(elem,name,type){
    if(arguments.length=2){
        document.write(elem.style[name])
    }
    else if(arguments.length=3){
        return elem.style[name]=type;
    }
}
css(test,"color");
css(test,"background-color","orange");
</script> 
</body> 
</html>