在js中获取在css中设置的background-image值

<div class="bg-color-two" id="bg_color_two" onclick="setBg(this)"></div>
<div class="bg-color-three" id="bg_color_three" onclick="setBg(this)"></div>

.bg-color-two {
        width: 40px;
        height:40px;
        background-image:url(811915c596d17e09d4f85bd7e80ccee7.jpg);
        background-size:40px 40px;
    }
.bg-color-three {
        width: 40px;
        height:40px;
        background-    image:url(675aa3366a8cda46febf0053c82e4f27.jpeg);
        background-size:40px 40px;
    }

function setBg(control) {
    //google用getComputedStyle(object, attr)方法获取style属性
    var bgImage = getComputedStyle(document.getElementById(control.id), "style").backgroundImage;
    console.log(bgImage); //bgImage = "url(file:///C:/Users/Gladys/Desktop/811915c596d17e09d4f85bd7e80ccee7.jpg) }