var $btnPosition = $(".btnPosition");? var $gradeTotal = $("#gradeTotal");? var gradeUsual = parseInt($("#gradeUsual").val());? var gradeEnd = + $("#gradeEnd").val();? var ?gradeTotal = gradeUsual*0.4+ gradeEnd*0.6;? $gradeTotal.click(function(){? ?? ? $("#gradeTotal").val($("#gradeUsual").val());?? })? $btnPosition.click(function(){? ? alert(typeof(gradeUsual));???? })通過<input></input>獲取值，但輸出卻是NAN，
為什么alert得到的是NAN，但數(shù)據(jù)類型是number
zhonghui
2015-12-07 00:56:35
