實現一個遍歷數組或對象裡所有成員的迭代器。
var each = function(obj, fn){
//+++++++++++答題區域+++++++++++
//+++++++++++答題結束+++++++++++
};
try{
var data1 = [4,5,6,7,8,9,10,11,12];
var data2 = {
"a": 4,
"b": 5,
"c": 6
};
console.group(data1);
each(data1, function(o){
if( 6 == this )
return true;
else if( 8 == this )
return false;
console.log(o + ": \"" + this + "\"");
});
console.groupEnd();
/*------[執行結果]------
1: "4"
2: "5"
4: "7"
------------------*/
console.group(data2);
each(data2, function(v, n){
if( 5 == this )
return true;
console.log(n + ": \"" + v + "\"");
});
console.groupEnd();
/*------[執行結果]------
a: "4"
c: "6"
------------------*/
}catch(e){
console.error("執行出錯，錯誤信息: " + e);
}