<img id="demoImg" src="...">
<script type="text/javascript">
var a = document.getElementById("demoImg");
var rootSrc = "跟路径"
var srcTxt = a.src(绝对路径)
var srcTxt = a.src.repleace(rootSrc)(相对路径);
var b = (需要加入的dom)
b.setAttrbute("src",srcTxt )
</script>
不知道对不对,记不住了
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