一个 JS 库，在网页插入迷你的页面缩略导航图，用户可以点击这个图的不同部分，实现快速导航。

Mini map for web pages. You can find an example on this web site in the top right corner. And there are two more demo pages: boxes and text.

Example usage

add a canvas tag to your HTML page:

<canvas id='map'></canvas>

fix it's position on the screen:

#map {
    position: fixed;
    top: 0;
    right: 0;
    width: 200px;
    height: 100%;
    z-index: 100;
}

init and style the mini map:

pagemap(document.querySelector('#map'), {
    viewport: null,
    styles: {
        'header,footer,section,article': rgba(0,0,0,0.08),
        'h1,a': rgba(0,0,0,0.10),
        'h2,h3,h4': rgba(0,0,0,0.08)
    },
    back: rgba(0,0,0,0.02),
    view: rgba(0,0,0,0.05),
    drag: rgba(0,0,0,0.10),
    interval: null
});