// 当body页面高度小于浏览窗口页面高度时,设置body页面为浏览窗口高度,foot 定位窗口底部
var body = $('body');
var vh100 = $('html').css('min-height','100vh').height();
var foot = $('.foot');
if(body.height() < vh100){
body.height(vh100);
foot.css({
"position": "fixed",
"bottom": 0,
"left": 0,
"width": "100vw"
})
}
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