<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> #p1{ font-size: 20px; } #div1{ width: 100px; height: 100px; background-color: #e2ff5f; } </style> </head> <body> <p style="color: red" id="p1">this is p</p> <span id="span1">span</span> <div id="div1"></div> <script src="js/jQuery-2.2.2-min.js"></script> <script> /*获取到元素的css样式*/ var res = $("#p1").css("color"); var res1 = $("#p1").css("font-size"); console.info(res); console.info(res1) /*设置样式,两个参数*/ $("#p1").css("background-color","green"); /*字体的加粗*/ $("#p1").css("font-weight","900"); $("#span1").css({"color":"red","font-size":"30px"}); /**/ $("#div1").click(function(){ /*n:表示当前元素的下标 val表示当前元素的值 返回的xxxpx*/ $(this).css({"width":function(n,val){ return parseInt(val)*2; },"height":function(n,val){ return parseInt(val)*2; }}); }); </script> </body> </html>