Add an id value for a canvas element in jquery

问题

How I dynamically add an id value for a canvas object in jQuery?

HTML

<div id="obj">
    <canvas></canvas>
    <canvas></canvas>
</div>

How do I change the second canvas object value with somename?

Expected result:

<canvas id="somename"></canvas>

回答1:

The $() function returns an array of matching DOM elements so you can just assign to the id property of the second element:

$('#obj canvas')[1].id = 'somename';

回答2:

Try this:

$("#obj canvas").slice(1).attr("id","somename");

来源：https://stackoverflow.com/questions/4976625/add-an-id-value-for-a-canvas-element-in-jquery