css 进度条的文字根据进度渐变

4

需求

1.进度条里面的文字需要根据进度的长度而变化

原理

用两个一模一样的样式的 div 重叠起来

效果

字体开始为 蓝色,跟随进度条变为 白色
图片描述

在线预览:

https://jsfiddle.net/lmxdawn/...

代码

<!DOCTYPE html>
<html lang="cmn-hans">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
    <script>!function(e,t){function n(){t.body?t.body.style.fontSize=12*o+"px":t.addEventListener("DOMContentLoaded",n)}function d(){var e=i.clientWidth/10;i.style.fontSize=e+"px"}var i=t.documentElement,o=e.devicePixelRatio||1;if(n(),d(),e.addEventListener("resize",d),e.addEventListener("pageshow",function(e){e.persisted&&d()}),o>=2){var a=t.createElement("body"),s=t.createElement("div");s.style.border=".5px solid transparent",a.appendChild(s),i.appendChild(a),1===s.offsetHeight&&i.classList.add("hairlines"),i.removeChild(a)}}(window,document);</script>
    <title>进度条渐变</title>
    <style type="text/css">
        * {
            box-sizing: border-box;
        }
        .box{
            position: fixed;
            left: 50%;
            transform: translate(-50%);
            width: 320px;
            height: 44px;
            background-color: white;
            color: #00a0e9;
            border: 1px solid #00a0e9;
        }
        .process{
            position: absolute;
            height: 100%;
            width: 0;
            background: #00a0e9;
            color: white;
            overflow: hidden;
            z-index: 10;
        }
        .process-text{
            position: absolute;
            left: 160px;
            top: 50%;
            font-size: 12px;
            transform: translate(-50%, -50%);
            white-space: nowrap;
        }
    </style>

    <script>
        function process() {
            var t = 1;
            var max = 320;
            var progress = document.getElementById("process");
            var process_texts = document.getElementsByClassName("process-text");
            var interval = setInterval(function () {
                if (t == max) {
                    clearInterval(interval);
                    for (var i in process_texts){
                        process_texts[i].innerHTML = '完成'
                    }
                } else {
                    progress.style.width = t + "px";
                    for (var i in process_texts){
                        process_texts[i].innerHTML = '进度' + (t / max * 100).toFixed(2) + "%"
                    }
                    t++;
                }
            }, 10)
        }
    </script>

</head>
<body>

<div class="box" onclick="process()">
    <div class="process" id="process">
        <span class="process-text">点击开始</span>
    </div>
    <span class="process-text">点击开始</span>
</div>

</body>
</html>

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