循环在javascript中不起作用

loop not working in javascript?

本文关键字：不起作用 javascript 循环      更新时间：2023-09-26

我想在javascript中创建等高函数，我使用getElementsByName方法来完成它，但它似乎不起作用，我想选择div的最大高度，并将其应用于具有相同id 的其他div

等高度函数

<script type="text/javascript">
function equalHeight () {
var get= document.getElementsByName('jj');
for (i=0;i<get.length;i++){
    var m = get[i].offsetHeight;
    alert (m)   
    var n= Math.max(m);


    document.getElementsByName('jj').style.height= n +"px";
}



    }
window.onload = equalHeight;


</script>
</head>
<body>
<div style="margin:0 auto; width:500px;">
<div style="border:solid #F00 1px; float:left; width:150px" name="jj">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</div>
<div name="jj" style="border:solid #F00 1px; float:right; width:150px">Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum" (The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, "Lorem ipsum dolor sit amet..", comes from a line in section 1.10.32.
The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested. Sections 1.10.32 and 1.10.33 from "de Finibus Bonorum et Malorum" by Cicero are also reproduced in their exact original form, accompanied by English versions from the 1914 translation by H. Rackham.</div>

</div>
</body>
</html>

问题是，您要获得与分配新高度相同的元素的高度。您需要首先获得最大高度。然后将其分配给所有div。JSFiddle演示

function equalHeight () {
     var divElements = document.getElementsByName('jj'),
         maxHeight = 0,
         i = 0;
     for (i = 0; i < divElements.length; i += 1) {
         maxHeight = divElements[i].offsetHeight > maxHeight ? divElements[i].offsetHeight : maxheight; 
     }
     for (i = 0; i < divElements.length; i += 1) { 
         divElements[i].style.height = maxHeight + 'px';
     }
}

我认为"equalHeight"函数应该是：

var get = document.getElementsByTagName('div'), 
    maxHeight = 0, i;
for (i = 0; i < get.length; i++) {
    var m = get[i].offsetHeight;
    if (m > maxHeight) {
        maxHeight = m;
    }
}
for (i = 0; i < get.length; i++) {
    get[i].style.height = maxHeight + "px";
}

div不支持name属性，您可以将所有div放在父div中，并给父div一个"id"，如下所示：

<div id="parent_div">
   <div></div>
   <div></div>
</div>

然后得到divs:

var get = document.getElementById("parent_div").getElementsByTagName("div");

试试这个，首先将类名添加到所有div中，即那些你想要相等的div，即class="jj"

function equalHeight()
{
    var el=document.getElementsByTagName("div");
    var maxHeight=0;
    for(var i=0;i<el.length;i++)
    {
        if(el[i].className=='jj')
        maxHeight = el[i].offsetHeight > maxHeight ? el[i].offsetHeight : maxHeight; 
    }
    for(var i=0;i<el.length;i++)
    {
        if(el[i].className=='jj')
        el[i].style.height = maxHeight + 'px';
    }
}   
window.onload = equalHeight;

for (i=0 ; i<get.length;i++){
    var m = get[i].offsetHeight;
    alert (m)   // your are missing an ; here
    var n= Math.max(m);
    document.getElementsByName('jj').style.height= n +"px";   
}
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