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<div class="divheight" style="text-align:center; width:100%;height:100%;margin:0px; " >
<button style="font-size:2em; width: 70%;height: 10%;background-color: red" class=" ub-ac bc-text-head bc-btn " onclick="setInfo()">支付</button>
</div>
获取class为divheight的高度:var divgd=$(".divheight").height();
$(".divheight").css("line-height",divgd+"px");
$(function () {
var divgd=$(".divheight").height();
$(".divheight").css("line-height",divgd+"px");
});
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<body>
<div style="text-align:center;height:50px;line-height:50px;background:red;"><button style="vertical-align:middle;">支付</button></div>
</body>
</html>
注意<!doctype html>