我正在使用以下 svg 元素
<svg class="layer1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 150 150">
<rect class="bg" id="bg" width="150" height="150" fill="#e6e6e6"></rect>
<circle class="circ0" id="circ0" cx="75" cy="75" r="72" fill="none" stroke="blue" stroke-linecap="round" stroke-linejoin="round"></circle>
<circle class="circ1" id="circ1" cx="75" cy="75" r="69" fill="none" stroke="green" stroke-linecap="round" stroke-linejoin="round"></circle>
<circle class="circ2" id="circ2" cx="75" cy="75" r="66" fill="none" stroke="red" stroke-linecap="round" stroke-linejoin="round"></circle>
<script href="index.js"></script>
</svg>
我想用javascript顛倒這些圓圈的順序,我目前正在這樣做
const svg = document.querySelector("svg");
var x = document.querySelectorAll("[class^='circ']");
var bucket = [];
x.forEach((a, i) => {
bucket.push(a)
});
bucket.reverse();
x.forEach(
(a, i) => a.parentNode.removeChild(a)
);
bucket.forEach(
(a, i) => {
a.setAttribute("class", 'circ' [i]);
a.setAttribute("id", "circ" [i]);
svg.appendChild(a);
}
)
<svg class="layer1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 150 150">
<rect class="bg" id="bg" width="150" height="150" fill="#e6e6e6"></rect>
<circle class="circ0" id="circ0" cx="75" cy="75" r="72" fill="none" stroke="blue" stroke-linecap="round" stroke-linejoin="round"></circle>
<circle class="circ1" id="circ1" cx="75" cy="75" r="69" fill="none" stroke="green" stroke-linecap="round" stroke-linejoin="round"></circle>
<circle class="circ2" id="circ2" cx="75" cy="75" r="66" fill="none" stroke="red" stroke-linecap="round" stroke-linejoin="round"></circle>
<script href="index.js"></script>
</svg>
它給了我這個

有沒有更好的方法來做到這一點?
uj5u.com熱心網友回復:
append(child)自己移動DOM 節點。所以你的代碼可以被簡化。
但是對于更復雜的 SVG,您可能想要交換DOM 位置,因為您不想影響其他元素。
- 按住CTRL鍵看看會發生什么
append - 單擊以查看交換版本,
即處理 Array 并將第一個元素與最后一個元素交換。 - 注意:
append在 Internet Explorer 中不可用,這就是您看到大多數帖子使用appendChild.
現代瀏覽器加載了更多的 DOM 好東西:replaceWithafter等等before。
<svg viewBox="0 0 10 10" style="height:200px">
<style>
text { font-size: 2px }
[y="3"]{ fill:yellow }
.first { stroke: black; stroke-width: 0.5 }
</style>
<rect class="bg" id="bg" width="10" height="10" fill="grey"></rect>
<circle class="first" id="c0" cx="2" cy="5" r="2" fill="red" />
<text x="0" y="3">R</text>
<circle class="second" id="c1" cx="4" cy="5" r="3" fill="green" />
<text x="1" y="3">G</text>
<circle class="last" id="c2" cx="6" cy="5" r="4" fill="blue" />
<text x="2" y="3">B</text>
<text x="1" y="6">Click Me!</text>
</svg>
<script>
let svg = document.querySelector("svg");
function append() {
[...svg.querySelectorAll("circle")]
.reverse().forEach((c, i) => {
c.parentNode.append(c);
c.setAttribute("class", c.id = 'c' i);
});
}
function swap() {
function swapElements(e1, e2) {
let {id,previousSibling,className:{baseVal:c2}} = e2;
e1.after(e2); // put e2 after e1
e2.id = e1.id; e2.setAttribute("class", e1.getAttribute("class"));
previousSibling.after(e1); // put e1 after where e2 WAS
e1.id = id; e1.setAttribute("class", c2);
}
let circles = [...svg.querySelectorAll("circle")];
while (circles.length) {
let c1 = circles.shift();
if (circles.length) swapElements(c1, circles.pop())
}
}
svg.onclick = (e) => (e.ctrlKey && append()) || swap();
</script>
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標籤:javascript html svg
