js 中class选择器，addClass，removeClass，hasClass，toggleClass，getByClass

时间：2023-12-30 17:04:32
<!doctype html>

<html>

<head>

<meta charset="utf-8">

<meta name="author" content="智能社 - zhinengshe.com" />

<meta name="copyright" content="智能社 - zhinengshe.com" />

<title>智能社 - www.zhinengshe.com</title>

<script src="http://lib.sinaapp.com/js/jquery/1.7.2/jquery.js"></script>

<script>

function getByClass(oParent,sClass){

    var ret = [];

    // test

    var re = new RegExp("\\b" + sClass + "\\b");

    //var re = /\bbtn\b/;

    var aEle = oParent.getElementsByTagName("*");

    for(var i = ; i < aEle.length; i++){

        if(re.test(aEle[i].className)){

            ret.push(aEle[i]);

        }

    }

    return ret;

}

function addClass(obj,sClass){

    var re = new RegExp("\\b"+sClass+"\\b");

    if(!re.test(obj.className)){

        if(obj.className){

            obj.className += " " + sClass;

        } else {

            obj.className = sClass

        }

    }

}

function removeClass(obj,sClass){

    var re = new RegExp("\\b"+sClass+"\\b","g");

    obj.className = obj.className.replace(re,"").replace(/^\s+|\s+$/g,"").replace(/\s+/g," ");

    if(!obj.className){

        obj.removeAttribute("class");

    }

}

function hasClass(obj,sClass){

    var re = new RegExp("\\b"+sClass+"\\b");

    return re.test(obj.className);

}

function toggleClass(obj,sClass){

    if(hasClass(obj,sClass)){

        removeClass(obj,sClass)

    } else {

        addClass(obj,sClass)

    }

}

window.onload = function(){

    var oBtn = document.getElementById("btn1");

    oBtn.onclick = function(){

        $(oBtn).toggleClass("active");

        //toggleClass(this,"active")

    };

};

</script>

</head>

<body>

<input id="btn1" class="box add btn active active active" type="button" value="toggleClass" />

</body>

</html>

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