例：function?box{
var?arr=[];
for(var?i=0;i<5;i++){
????arr[i]=function(){
????????return?i;
????????};
????}
????return?arr;
}
var?b=box();
for(var?i=0;i<5;i++){
????alert(b[i]());
}
為什么這個(gè)打印出來(lái)的是55555
而下面這個(gè)
function?box{
var?arr=[];
for(var?i=0;i<5;i++){
????arr[i]=(function(num){
????????return?function(){
????????????return?num;
????????????}
????????})(i);
????}
????return?arr;
}
var?b=box();
for(var?i=0;i<5;i++){
????alert(b[i]);
}
這個(gè)打印出來(lái)的結(jié)果是0,1,2,3,4
麻煩大家?guī)兔纯矗P(guān)于javascript的問(wèn)題
ZXJ03
2017-04-14 22:53:51
