動畫jQuery中的頁邊距計算

Question

我需要從窗口height/2中減去10%，但沒有結果，問題是什麼？

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

Answer 1

計算90個，並設值爲

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

Answer 2

你可以嘗試這樣就算了，

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 
    });