<div class="one">我是one</div>
<div class="wrap">
    <div class="one">我也是one</div>
    <div class="two">我也two</div>
    <div class="one">i'm one too</div>
</div>
<script>
    function selectorClass(className) {
        if (className.indexOf('.') === 0) {
            className = className.slice(1);
        }
        return document.getElementsByClassName(className);
    }
    var oneObjArr = selectorClass('.one');
    console.log(oneObjArr);
    for (var i in oneObjArr) {
        oneObjArr[i].innerHTML = '我们都是one'
    }
</script>

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