function factorial(num){
if(num <= 1){
return 1;
}else{
return num * arguments.callee(num-1);
}
}
var trueFactorial = factorial;
alert(trueFactorial(5)); //120
factorial = function() {
return 0;
}
alert(trueFactorial(5));// 120 如果没有使用arguments.callee,将返回0
关键看 var trueFactorial = factorial;的位置,而 factorial = function() {return 0;}的 函数无法提前,调用只能在函数之后调用
var factorial = function() {
return 0;
}
var trueFactorial = factorial;
alert(trueFactorial(5)); //0
function factorial(num){
if(num <= 1){
return 1;
}else{
return num * arguments.callee(num-1);
}
}
alert(trueFactorial(5));// 0
var trueFactorial = factorial;
alert(trueFactorial(5)); //120
var factorial = function() {
return 0;
}
function factorial(num){
if(num <= 1){
return 1;
}else{
return num * arguments.callee(num-1);
}
}
alert(trueFactorial(5));// 120
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