JavaScript勉強会 11/29 | Codetter（こーどったー）

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var $ = function(name) {
    return document.getElementById(name);
};
var counter = 0;
var update = function() {
    counter++;
    if (counter < 200) {
        $("box").style.height = counter + "px";
    }
}
$("box").onclick = function() {
    alert("あなたはすごい");
}
setInterval(update, 100);
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