javascript - 简单的 onclick 事件只工作一次

Question

请帮忙)为什么这个结构不起作用？增量只发生一次。

var player = document.getElementById("player");
var button = document.getElementById("button");

function moveDown(object) {
    object.style.top += 32;
}

button.onclick = function() {
    moveDown(player);
}

Answer 1

演示:http://jsfiddle.net/SrQUh/1/

var player = document.getElementById("player");
var button = document.getElementById("button");

function moveDown(object) {
  object.style.top = parseInt(object.style.top || 0) + 32 + 'px';
}

button.onclick = function() {
    moveDown(player);
}​