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クロージャ javaプログラマのjavascript入門

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var outer = 'outer';
var later;

function outerFunc() {
var inner=0;

function innerFunc(){
    document.write(outer+'<br/>');
    document.write(inner+'<br/>');
    inner++;
}
innerFunc();
later=innerFunc; // クロージャを作る

}
// クロージャを持たないのでinnerの値は2回とも0になる
outerFunc();
outerFunc();
// クロージャを持つのでinnerの参照が保持され、インクリメントされていく
later();
later();
// グローバル変数の状態はやはり直に影響を受ける
outer = 'outer2';
later();

実行結果
outer
0
outer
0 ←クロージャが無いので状態が保持されない
outer
1 ←クロージャ内で状態が保持されるためインクリメントされる
outer
2
outer2 ←グローバル変数の影響はクロージャ内でも受ける
3

lasaya
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