动画jquery中的边距顶部计算

Question

我需要从窗口10%中减去height/2，但没有结果，问题是什么？

var loadingMargin = $(window).height()/2; 
$(".loading .sk-circle").animate({
   marginTop: loadingMargin-10+"%" 
});   

Answer 1

计算90百分比并设置值

var loadingMargin = ($(window).height() / 2) * .9;
$(".loading .sk-circle").animate({
  marginTop: loadingMargin
});

Answer 2

你甚至可以尝试这样做，

var loadingMargin = ($(window).height())/2, //window Height /2
    calMargin = loadingMargin*0.1, //10% of window height
    substractVal = (loadingMargin - calMargin); //substract value

    $(".loading .sk-circle").animate({
         marginTop : substractVal
    });