# JS实现鼠标样式

📖 阅读信息

阅读时间：1 分钟 | 中文字符：129 | 有效代码行数：114

不建议更改，因为默认就是最简洁

在`docs/javascripts/extra.js`下复制粘贴：

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    var CURSOR;

    Math.lerp = (a, b, n) => (1 - n) * a + n * b;

    const getStyle = (el, attr) => {
        try {
            return window.getComputedStyle
                ? window.getComputedStyle(el)[attr]
                : el.currentStyle[attr];
        } catch (e) {}
        return "";
    };

    class Cursor {
        constructor() {
            this.pos = {curr: null, prev: null};
            this.pt = [];
            this.create();
            this.init();
            this.render();
        }

        move(left, top) {
            this.cursor.style["left"] = `${left}px`;
            this.cursor.style["top"] = `${top}px`;
        }

        create() {
            if (!this.cursor) {
                this.cursor = document.createElement("div");
                this.cursor.id = "cursor";
                this.cursor.classList.add("hidden");
                document.body.append(this.cursor);
            }

            var el = document.getElementsByTagName('*');
            for (let i = 0; i < el.length; i++)
                if (getStyle(el[i], "cursor") == "pointer")
                    this.pt.push(el[i].outerHTML);

            document.body.appendChild((this.scr = document.createElement("style")));
            // 这里改变鼠标指针的颜色 由svg生成
            this.scr.innerHTML = `* {cursor: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8' width='8px' height='8px'><circle cx='4' cy='4' r='4' opacity='.5'/></svg>") 4 4, auto}`;
        }

        refresh() {
            this.scr.remove();
            this.cursor.classList.remove("hover");
            this.cursor.classList.remove("active");
            this.pos = {curr: null, prev: null};
            this.pt = [];

            this.create();
            this.init();
            this.render();
        }

        init() {
            document.onmouseover  = e => this.pt.includes(e.target.outerHTML) && this.cursor.classList.add("hover");
            document.onmouseout   = e => this.pt.includes(e.target.outerHTML) && this.cursor.classList.remove("hover");
            document.onmousemove  = e => {(this.pos.curr == null) && this.move(e.clientX - 8, e.clientY - 8); this.pos.curr = {x: e.clientX - 8, y: e.clientY - 8}; this.cursor.classList.remove("hidden");};
            document.onmouseenter = e => this.cursor.classList.remove("hidden");
            document.onmouseleave = e => this.cursor.classList.add("hidden");
            document.onmousedown  = e => this.cursor.classList.add("active");
            document.onmouseup    = e => this.cursor.classList.remove("active");
        }

        render() {
            if (this.pos.prev) {
                this.pos.prev.x = Math.lerp(this.pos.prev.x, this.pos.curr.x, 0.15);
                this.pos.prev.y = Math.lerp(this.pos.prev.y, this.pos.curr.y, 0.15);
                this.move(this.pos.prev.x, this.pos.prev.y);
            } else {
                this.pos.prev = this.pos.curr;
            }
            requestAnimationFrame(() => this.render());
        }
    }

    (() => {
        CURSOR = new Cursor();
        // 需要重新获取列表时，使用 CURSOR.refresh()
    })();

其中比较重要的参数就是鼠标的尺寸和颜色，已经在上图中标出，目前发现颜色只支持RGB写法和固有名称写法（例如red这种），其他参数也可以自行摸索：

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    * {cursor: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8' width='8px' height='8px'><circle cx='4' cy='4' r='4' opacity='1.0' fill='rgb(57, 197, 187)'/></svg>") 4 4, auto}`

在docs/stylesheets/extra.css添加如下代码：

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    /* 鼠标样式 */
    #cursor {
      position: fixed;
      width: 16px;
      height: 16px;
      /* 这里改变跟随的底色 */
      background: var(--theme-color);
      border-radius: 8px;
      opacity: 0.25;
      z-index: 10086;
      pointer-events: none;
      transition: 0.2s ease-in-out;
      transition-property: background, opacity, transform;
    }

    #cursor.hidden {
      opacity: 0;
    }

    #cursor.hover {
      opacity: 0.1;
      transform: scale(2.5);
      -webkit-transform: scale(2.5);
      -moz-transform: scale(2.5);
      -ms-transform: scale(2.5);
      -o-transform: scale(2.5);
    }

    #cursor.active {
      opacity: 0.5;
      transform: scale(0.5);
      -webkit-transform: scale(0.5);
      -moz-transform: scale(0.5);
      -ms-transform: scale(0.5);
      -o-transform: scale(0.5);
    }

这里比较重要的参数就是鼠标跟随的圆形颜色，可以根据自己的喜好进行更改：

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    #cursor {
      /* 这里改变跟随的底色 */
      background: rgb(57, 197, 187);
    }

注意⚠️

需要在mkdocs.yml中引入js和css

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    extra_javascript:
      - javascripts/extra.js
      - javascripts/mathjax.js
    extra_css:
      - stylesheets/extra.css

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