.getJSON中的变量显示错误 [英] for variable within .getJSON displayed wrong

问题描述

我有以下代码(javascript/jQuery)

I have the following code (javascript/jQuery)

$(function(){
    for(var i=0;i<3;i++){

        $.getJSON("https://api.twitch.tv/kraken/streams/esl_csgo", function(data){
            console.log(i);
            console.log(data);
        });
    }
});

控制台日志:

3
Object { stream: Object, _links: Object }
3
Object { stream: Object, _links: Object }
3
Object { stream: Object, _links: Object }

是不是真的，console.log(i);应该在第一个循环中记录0，在第二个循环中记录1，在第三个循环中记录2?但是总会以某种方式返回3:(

isn't it true, that console.log(i); should log 0 in the first loop, 1 in the second and 2 in the third? But somehow it always returns 3 :(

推荐答案

尝试一下

$(function(){
    for(var i=0;i<3;i++){
        (function (index) {
            $.getJSON("https://api.twitch.tv/kraken/streams/esl_csgo", function(data) {
                console.log(index);
                console.log(data);
            });
        })(i)
    }
});

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