removeClass

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<script>window.onload = function(){    var oDiv = document.getElementById('div1');    removeClass(oDiv, 'box1')    function removeClass(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; i++)        {   if(arr[i] == v){                return i;            }        }        return -1;    }};</script></head><body><div id="div1" class="box box1"></div></body>
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