<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
</body>
<script type="text/javascript">
function factorial(num){
if(num<=1){
return 1;
}else{
return num*arguments.callee(num-1); //
}
}
// function factorial(num){
// if(num<=1){
// return 1;
// }else{
// return num*factorial(num-1);
// }
// }
var trueFactorial = factorial;
//此处是值的复制的过程
factorial = function(){
return 0;
}
alert(trueFactorial(5));//120
alert(factorial(5));//0
var objone = {
name:'tom',
age:28
}
var objtwo = {
name:'lili',
age:30
}
objtwo.name = objone.name;
objone.name = 'huahua';
console.log(objtwo);
console.log(objone);
</script>
</html>
如图
image.png
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