我做了这个代码:
function get_coordinates(container) {
var x;
var y;
var divs = container.getElementsByTagName('div');
Array.from(divs).forEach(div => {
y += div.offsetTop+" ";
x += div.offsetLeft + " ";
});
const a = x + ";" + y;
console.log(divs);
return x+";"+y;
}
这是控制台日志(log):
HTMLCollection(10) [div#selector_1.selector, div#selector_2.selector, div#selector_3.selector, div#selector_4.selector, div#selector_5.selector, div#selector_6.selector, div#selector_7.selector, div#selector_8.selector, div#selector_9.selector, div#selector_10.selector, selector_1: div#selector_1.selector, selector_2: div#selector_2.selector, selector_3: div#selector_3.selector, selector_4: div#selector_4.selector, selector_5: div#selector_5.selector, …]
这就是回报:
未定义0 0 0 0；未定义0 0 0 0 0 0 0 0 0 0 0
我不明白为什么两个开头都没有定义.