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html:
<div class="container">
<img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1545633786675&di=1b43ca4fe89c44cc06b026d21f646e91&imgtype=0&src=http%3A%2F%2Fimg.daimg.com%2Fuploads%2Fallimg%2F171221%2F1-1G221000211.jpg" style="" class="image">
<p class="console"></p>
</div>
js:
//图片尺寸按苹果6尺寸大小
var imgH = 667;
var imgW = 375;
var imgDom = $(".image");//获取图片
var winDom = $(window);//获取窗口
//使用resize()
winDom.resize(function(){
var winwHeight = winDom.height();//获取窗口高度
var winwWidth = winDom.width();//获取窗口宽度
var imgHeight = winwHeight*0.5;//图片的高度是窗口高度的一半
var imgWidth = imgW/imgH*imgHeight;//图片的宽度根据图片的原始宽高比值和窗口高度计算出宽度
//imgDom.attr("height",imgHeight).attr("width",imgWidth);
imgDom.css({"height":imgHeight,"width":imgWidth});//给图片赋计算后的宽高
var imgInfo = "图片宽:"+imgWidth+"图片高:"+imgHeight;
$(".console").text("窗口宽:"+winwWidth+"窗口高:"+winwHeight + imgInfo );
});