# # 教程开始：

首先是css样式部分

/*
*3D标签云
*/
#tag_cloud_widget{position:relative;width:240px;height:240px;margin:10px auto 10px}
#tag_cloud_widget a{position:absolute;color:#fff;text-align:center;text-overflow:ellipsis;white-space:nowrap;top:0;left:0;padding:3px 5px;border:0}
#tag_cloud_widget a:hover{background:#d02f53;display:block}
#tag_cloud_widget a:nth-child(n){background:#666;border-radius:3px;display:inline-block;line-height:18px;margin:0 10px 15px 0}
#tag_cloud_widget a:nth-child(2n){background:#d1a601}
#tag_cloud_widget a:nth-child(3n){background:#286c4a}
#tag_cloud_widget a:nth-child(5n){background:#518ab2}
#tag_cloud_widget a:nth-child(4n){background:#c91d13}

然后是JS部分，新建3dtag.js放在当前模板js 目录下

var radius = 100;
var d = 200;
var dtr = Math.PI / 180;
var mcList = [];
var lasta = 1;
var lastb = 1;
var distr = true;
var tspeed = 11;
var size = 200;
var mouseX = 0;
var mouseY = 10;
var howElliptical = 1;
var aA = null;
var oDiv = null;
window.onload=function (){
    var i=0;
    var oTag=null;
    oDiv=document.getElementById('tag_cloud_widget');
    aA=oDiv.getElementsByTagName('a');
    for(i=0;i<aA.length;i++){
        oTag={};        
        aA[i].onmouseover = (function (obj) {
            return function () {
                obj.on = true;
                this.style.zIndex = 9999;
                this.style.color = '#fff';
                this.style.background = '#0099ff';
                this.style.padding = '5px 5px';
                this.style.filter = "alpha(opacity=100)";
                this.style.opacity = 1;
            }
        })(oTag);
        aA[i].onmouseout = (function (obj) {
            return function () {
                obj.on = false;
                this.style.zIndex = obj.zIndex;
                this.style.color = '#fff';
                this.style.background = '#30899B';
                this.style.padding = '5px';
                this.style.filter = "alpha(opacity=" + 100 * obj.alpha + ")";
                this.style.opacity = obj.alpha;
                this.style.zIndex = obj.zIndex;
            }
        })(oTag);
        oTag.offsetWidth = aA[i].offsetWidth;
        oTag.offsetHeight = aA[i].offsetHeight;
        mcList.push(oTag);
    }
    sineCosine(0,0,0);
    positionAll();
    (function () {
        update();
        setTimeout(arguments.callee, 40);
    })();
};
function update()
{
    var a, b, c = 0;
    a = (Math.min(Math.max(-mouseY, -size), size) / radius) * tspeed;
    b = (-Math.min(Math.max(-mouseX, -size), size) / radius) * tspeed;
    lasta = a;
    lastb = b;
    if (Math.abs(a) <= 0.01 && Math.abs(b) <= 0.01) {
        return;
    }
    sineCosine(a, b, c);
    for (var i = 0; i < mcList.length; i++) {
        if (mcList[i].on) {
            continue;
        }
        var rx1 = mcList[i].cx;
        var ry1 = mcList[i].cy * ca + mcList[i].cz * (-sa);
        var rz1 = mcList[i].cy * sa + mcList[i].cz * ca;

        var rx2 = rx1 * cb + rz1 * sb;
        var ry2 = ry1;
        var rz2 = rx1 * (-sb) + rz1 * cb;

        var rx3 = rx2 * cc + ry2 * (-sc);
        var ry3 = rx2 * sc + ry2 * cc;
        var rz3 = rz2;

        mcList[i].cx = rx3;
        mcList[i].cy = ry3;
        mcList[i].cz = rz3;

        per = d / (d + rz3);

        mcList[i].x = (howElliptical * rx3 * per) - (howElliptical * 2);
        mcList[i].y = ry3 * per;
        mcList[i].scale = per;
        var alpha = per;
        alpha = (alpha - 0.6) * (10 / 6);
        mcList[i].alpha = alpha * alpha * alpha - 0.2;
        mcList[i].zIndex = Math.ceil(100 - Math.floor(mcList[i].cz));
    }
    doPosition();
}
function depthSort()
{
    var i=0;
    var aTmp=[];
    for(i=0;i<aA.length;i++)
    {
        aTmp.push(aA[i]);
    }
    aTmp.sort
    (
        function (vItem1, vItem2)
        {
            if(vItem1.cz>vItem2.cz)
            {
                return -1;
            }
            else if(vItem1.cz<vItem2.cz)
            {
                return 1;
            }
            else
            {
                return 0;
            }
        }
    );
    for(i=0;i<aTmp.length;i++)
    {
        aTmp[i].style.zIndex=i;
    }
}
function positionAll()
{
    var phi = 0;
    var theta = 0;
    var max = mcList.length;
    for (var i = 0; i < max; i++) {
        if (distr) {
            phi = Math.acos(-1 + (2 * (i + 1) - 1) / max);
            theta = Math.sqrt(max * Math.PI) * phi;
        } else {
            phi = Math.random() * (Math.PI);
            theta = Math.random() * (2 * Math.PI);
        }
        //坐标变换
        mcList[i].cx = radius * Math.cos(theta) * Math.sin(phi);
        mcList[i].cy = radius * Math.sin(theta) * Math.sin(phi);
        mcList[i].cz = radius * Math.cos(phi);

        aA[i].style.left = mcList[i].cx + oDiv.offsetWidth / 2 - mcList[i].offsetWidth / 2 + 'px';
        aA[i].style.top = mcList[i].cy + oDiv.offsetHeight / 2 - mcList[i].offsetHeight / 2 + 'px';
    }
}
function doPosition()
{
    var l = oDiv.offsetWidth / 2;
    var t = oDiv.offsetHeight / 2;
    for (var i = 0; i < mcList.length; i++) {
        if (mcList[i].on) {
            continue;
        }
        var aAs = aA[i].style;
        if (mcList[i].alpha > 0.1) {
            if (aAs.display != '') aAs.display = '';
        } else {
            if (aAs.display != 'none') aAs.display = 'none'; continue;
        }
        aAs.left = mcList[i].cx + l - mcList[i].offsetWidth / 2 + 'px';
        aAs.top = mcList[i].cy + t - mcList[i].offsetHeight / 2 + 'px';
        //aAs.fontSize=Math.ceil(12*mcList[i].scale/2)+8+'px';
        //aAs.filter="progid:DXImageTransform.Microsoft.Alpha(opacity="+100*mcList[i].alpha+")";
        aAs.filter = "alpha(opacity=" + 100 * mcList[i].alpha + ")";
        aAs.zIndex = mcList[i].zIndex;
        aAs.opacity = mcList[i].alpha;
    }
}
function sineCosine( a, b, c)
{
    sa = Math.sin(a * dtr);
    ca = Math.cos(a * dtr);
    sb = Math.sin(b * dtr);
    cb = Math.cos(b * dtr);
    sc = Math.sin(c * dtr);
    cc = Math.cos(c * dtr);
}

最关键的module.php 在合适的地方插入:

<?php
//3D标签云
function widget_3dtag(){
    global $CACHE;
    $tag_cache = $CACHE->readCache('tags');?>
    <div id="tag_cloud_widget">
    <script type="text/javascript" src="<?php echo TEMPLATE_URL; ?>js/3dtag.js"></script>
    <?php foreach($tag_cache as $value): ?>
    <a href="<?php echo Url::tag($value['tagurl']); ?>" title="<?php echo $value['usenum']; ?> 篇文章"><?php echo $value['tagname']; ?></a>
    <?php endforeach; ?>
    </div>
<?php }?>

调用格式：

<?php echo widget_3dtag();?>

自行添加在侧边栏

例如：emlog大前端，添加css与js后。
module.php 添加功能

<div class="widget widget_ui_tags"><span class="icon"><i class="fa fa-tag"></i></span><h3>3D标签云</h3>

            <?php echo widget_3dtag('');?>

    </div>