1.==與===的區別
http://blog.csdn.net/u010127996/article/details/51140227
2.在js代碼中var a=$('.demo').css('margin-top'); a爲一個字符串而不是數字
將字符串轉變成數字:var a=parseInt(a);
1.==與===的區別
http://blog.csdn.net/u010127996/article/details/51140227
2.在js代碼中var a=$('.demo').css('margin-top'); a爲一個字符串而不是數字
將字符串轉變成數字:var a=parseInt(a);
(function(d, s, id) { let js, fjs = d.getElementsByTagName(s)[0]; if (d.getElementById(id)) retur