<script type="text/javascript">
 <!--
 //普通方法
 function commonArg(name,age,desc){
  var userinfo="name: "+name+","+"age: "+age+"\ndescription: "+desc;
  alert(userinfo);
 }
 commonArg("yemoo",22,"a boy!")//每次调用都必须按照规定的参数顺序书写，如果写成commonArg(22,"yemoo","desc")则返回信息就不对，每次都必须记忆每个参数意义及顺序
 
 //JSON参数法
 function jsonArg(info){
  var userinfo="name: "+info.name+"\tage: "+info.age+"\ndescription: "+info.desc;
  alert(userinfo);
 }
 jsonArg({name:"blue",age:22,desc:"a gril?"});
 jsonArg({desc:"not a people!",name:"sss",age:0});
 //参数位置可以随意写
 //-->
 </script>

<script type="text/javascript">
 <!--
 //普通方法
 function commonArg(name,age,desc){
  var userinfo="name: "+(name||"empty")+"\tage: "+(age||0)+"\ndescription: "+desc||"empty";
  alert(userinfo);
 }
 //当只需要设定后面的参数时前面每个参数都需要设置为null
 commonArg("tempUser");
 commonArg(null,null,"a boy!");
 commonArg(null,20);
 
 //JSON参数法
 function jsonArg(info){
  var userinfo="name: "+(info.name||"empty")+"\tage: "+(info.age||0)+"\ndescription: "+(info.desc||"empty");
  alert(userinfo);
 }
 //每次只需要设置需要设定参数项
 jsonArg({name:"tempUser"});
 jsonArg({desc:"a boy!"});
 jsonArg({age:20});
 //-->
 </script>