js指引提示-下一步-下一步

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
    <head>
        <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
        <title>css实现用户引导</title>
        <style type="text/css">
            html,
            body {
                width: 100%;
                height: 100%;
            }

            * {
                margin: 0;
                padding: 0;
                box-sizing: border-box;
            }

            #first-step {
                height: 100px;
                width: 300px;
                border: 1px solid black;
                border-radius: 4px;
                line-height: 100px;
                text-align: center;
                position: absolute;
                top: 50px;
                left: 200px;
            }

            #second-step {
                height: 100px;
                width: 300px;
                border: 1px solid black;
                border-radius: 4px;
                line-height: 100px;
                text-align: center;
                position: absolute;
                top: 50px;
                left: 800px;
            }

            #third-step {
                height: 100px;
                width: 300px;
                border: 1px solid black;
                border-radius: 4px;
                line-height: 100px;
                text-align: center;
                position: absolute;
                top: 500px;
                left: 200px;
            }

            .mask-tip {
                min-width: 175px;
                text-align: center;
                border: 1px solid rgb(0, 94, 166);
                border-radius: 4px;
                padding: 5px 10px;
                position: absolute;
                top: 120px;
                left: 65px;
                background: white;
            }

            .mask-tip:before {
                content: "";
                width: 10px;
                height: 10px;
                border: 1px solid rgb(0, 94, 166);
                background: white;
                position: absolute;
                transform: rotate(45deg);
                top: -6px;
                left: 85px;
                border-right-width: 0;
                border-bottom-width: 0;
            }

            .mask-tip-desc {
                display: block;
                margin-bottom: 10px;
            }

            .mask-tip-btn {
                border-radius: 4px;
                padding: 6px;
                border: none;
                background-color: rgb(0, 94, 166);
                cursor: pointer;
                color: white;
            }
        </style>
    </head>
    <body>
        <div id="first-step">第一步</div>

        <div id="second-step">第二步</div>

        <div id="third-step">第三步</div>

        <div id="mask">
            <div class="mask-tip">
                <span id="mask-desc" class="mask-tip-desc"></span>
                <button id="mask-next" class="mask-tip-btn">下一步</button>
            </div>
        </div>
    </body>
    <script type="text/javascript">
        function getElementById(id) {
            return document.getElementById(id);
        };

        function mask(params) {
            var mask = getElementById('mask');

            if (params.length === 0) {
                mask.style.display = 'none';
                return;
            }

            var {
                id,
                desc
            } = params[0];

            /****************   获取要cover的元素基本信息   ****************/
            var ele = getElementById(id);
            var offsetWidth = ele.offsetWidth;
            var offsetHeight = ele.offsetHeight;
            var offsetLeft = ele.offsetLeft;
            var offsetTop = ele.offsetTop;

            console.log(offsetWidth, offsetHeight, offsetLeft, offsetTop);

            /****************   获取屏幕大小，包含滚动区域   ****************/
            var scrollWidth = document.body.scrollWidth;
            var scrollHeight = document.body.scrollHeight;

            console.log(scrollWidth, scrollHeight);

            /****************   为Mask设置css   ****************/
            mask.style.width = scrollWidth + 'px';
            mask.style.height = scrollHeight + 'px';
            mask.style.borderColor = "rgba(0, 0, 0, 0.75)";
            mask.style.borderStyle = 'solid';
            mask.style.borderLeftWidth = offsetLeft - 5 + 'px';
            mask.style.borderRightWidth = (scrollWidth - offsetWidth - offsetLeft - 5) + 'px';
            mask.style.borderTopWidth = offsetTop - 5 + 'px';
            mask.style.borderBottomWidth = (scrollHeight - offsetHeight - offsetTop - 5) + 'px';
            mask.style.position = 'absolute';
            mask.style.left = 0;
            mask.style.top = 0;

            /****************   为Mask设置desc   ****************/
            var maskDesc = getElementById('mask-desc');
            maskDesc.innerHTML = desc;

            /****************   绑定next事件   ****************/
            var nextBtn = getElementById('mask-next');
            (function(mask) {
                nextBtn.onclick = function() {
                    params.shift();
                    mask(params);
                };
            })(arguments.callee);
        };

        mask([{
                id: 'first-step',
                desc: '我是第一步的说明'
            },
            {
                id: 'second-step',
                desc: '我是第二步的说明'
            },
            {
                id: 'third-step',
                desc: '我是第三步的说明'
            }
        ]);
    </script>
</html>
js指引提示-下一步-下一步

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