javascript - querySelector returns undefined string when trying to access numeric value as the ID of an element

Question

querySelector() returns undefined string when trying to access numeric value as the ID of an element. I would like to use querySelector() method over others, because it is more flexible. Any solutions to this problem would be a great help.

var foo = document.querySelector('#1');
console.log(foo);

jsFiddle

Answer 1

奇怪..无论如何这：document.querySelector('[id="1"]')正在工作。小提琴：http: //jsfiddle.net/wnd7K/2/

Answer 2

重命名元素的 id 以使它们以字母开头可以解决您的问题，例如： <div id="a1"></div>