Javascript:循环关闭? [英] Javascript: closure of loop?

问题描述

我想做以下事情:

for (var i = 0; i < 10; ++i) {
    createButton(x, y, function() { alert("button " + i + " pressed"); }
}

问题在于我总是得到 i 的最终值，因为 Javascript 的闭包不是按值的.
那么我怎样才能用 javascript 做到这一点呢?

The problem with this is that I always get the final value of i because Javascript's closure is not by-value.
So how can I do this with javascript?

推荐答案

for(var i = 0; i < 10; i++) {
    (function(i) {
        createButton(function() { alert("button " + i + " pressed"); });
    })(i);
}

请注意，JSLint 不喜欢这种模式.它抛出不要在循环中创建函数.".

Note that JSLint doesn't like this pattern. It throws "Don't make functions within a loop.".

现场演示: http://jsfiddle.net/simevidas/ZKeXX/

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