原生JavaScript操作CSS类名——hasClass,addClass,removeClass

原生JavaScript操作CSS类名className——hasClass,addClass,removeClass

验证当前元素是否包含className这个类名

function hasClass(curEle, className) {  var reg = new RegExp("(^| +)" + className + "( +|$)");  return reg.test(curEle.className);}

给元素添加样式类名

function addClass(curEle, className) {  var arr = className.replace(/(^ +| +$)/g, "").split(/ +/g); // 先去首尾空格，为了防止className为多个类名 "box1 box2"  for (var i = 0,len=className.length; i < len; i++) {    var curName = arr[i];    if (!hasClass(curEle, className)) {      curEle.className += " " + curName;    }  }}

移除类名

function removeClass(curEle, className) {  var arr = className.replace(/(^ +| +$)/g, "").split(/ +/g);  for (var i = 0, len = className.length; i < len; i++) {    var curName = arr[i];    if (hasClass(curEle, curName)) {      var reg = new RegExp("(^| +)" + curName + "( +|$)", "g");      curEle.className = curEle.className.replace(reg, " ");    }  }}