html：

<span class="dw-xd">
	<img alt="[field:alttext /]" title="[field:alttext /]" class="shijue-idea-img"  style="max-width: 1140px; display: block;margin: 0 auto;" src="[field:imgsrc/]" id="bigImg">
	<a href="[field:linkurl/]" class="view-bigshow" title="[field:title /]" target="_blank">[field:title /]</a>
</span>
 

        <script type="text/javascript">
		// 根據視窗高度來設定圖片的高度
		var screenHeight = $(window).height();  
		height = screenHeight-140;
		$("#bigImg").css("max-height",height);
	</script>