[導讀]數組默認有迭代器屬性

數組默認有迭代器屬性var?arr?=?[111,222,333];

var?aa?=?arr[Symbol.iterator]();

aa.next();?//?{?value:?111,?done:?false?}

aa.next();?//?{?value:?222,?done:?false?}

aa.next();?//?{?value:?333,?done:?false?}

aa.next();?//?{?value:?undefined,?done:?true?}

可以用在 數組 Map Set 類數組var?m?=?new?Set([11,22,33]);//set類似于數組

console.log(m);

var?qq=m[Symbol.iterator]();

console.log(qq.next());//{value:?11,?done:?false}

var?s?=?new?Map([['name','shi'],['age',3]]);

s.set("sex",'nv')

console.log(s);

var?i=s[Symbol.iterator]();

console.log(i.next());

類數組var?try=document.getElementsByName("div");

console.log(try);

自定義遍歷器var?arr?=?[111,222,333];

function?aa(arr){

var?i=-1;

function?next(){

i++;

let?value;

let?done=false;

if?(i==arr.length)?{

value=undefined;

done=true;

}else{

value=arr[i];

}

return{value:value,done:done};

}

return?{next:next};

}

var?zz=aa(arr);

console.log(zz.next());//Object?{value:?111,?done:?false}

console.log(zz.next());//Object?{value:?222,?done:?false}

console.log(zz.next());//Object?{value:?333,?done:?false}

console.log(zz.next());//Object?{value:?undefined,?done:?true}

總結

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