<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>添加Class</title> <script> window.onload=function(){ var oDiv=document.getElementById('div1'); //addClass(oDiv,'box'); moveClass(oDiv,'box'); /*function addClass(obj,className){ if(obj.className==' '){ obj.className=className; }else { //obj.className +=' ' +className; //如果原來有class //如果要添加的class在原來的class中不存在 var arrClassName=obj.className.split(' '); var _index = arrIndexOf(arrClassName,className); if(_index==-1){ obj.className += ' '+className; } } }*/ function moveClass(obj,className){ if(obj.className !=''){ var arrClassName=obj.className.split(' '); var _index=arrIndexOf(arrClassName,className); if(_index !=-1){ arrClassName.splice(_index,1); obj.className=arrClassName.join(' '); } } } function arrIndexOf(arr,v){ for (var i=0;i<arr.length;){ if(arr[i]==v){ return i; } return -1; } } } </script> </head> <body> <div id="div1" class="box" ></div> </body> </html>
