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手机端 H5上传头像

2024-08-11 07:51:12   220人阅读

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name = "viewport" content= "width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
    <meta name = "apple-mobile-web-app-capable" content= "yes" />
    <meta name = "apple-mobile-web-app-status-bar-style" content= "black" />
    <meta name = "format-detection" content= "telephone=no" >
    <title>HTML5 调用手机拍照并压缩上传</title>
    <style>
        *{
            padding:0;
            margin:0;
        }
        h1{
            height:42px;
            line-height: 42px;
            background:#3548cc;
            color: #fff;
            font-size: 21px;
            font-weight: 400;
            text-align: center;
        }
        div.wrapper{
            position: relative;
            height: 200px;
            overflow: hidden;
        }
        .user-avatar{
            margin-top:20px;
            font-size: 16px;
            color:#3548cc;
            margin-left: 20px;
            display: inline-block;
        }
        .input-upload-image,.upload-btn{
            width: 100px;
            height: 100px;
            display: block;
            position: absolute;
            top:20px;
            left: 120px;
        }
        .input-upload-image{
            z-index: 1;
            border:none;
            -webkit-opacity:0;
            opacity: 0;
        }
        .upload-btn{
            z-index: 2;
        }
        .events-pointer-none{
            pointer-events: none;
            cursor: pointer;
        }
        .show-result{
            padding: 20px;
            font-size: 14px;
            line-height: 24px;
            color: #3548cc;
        }
        .show-result .small{
            font-size: 12px;
            color:green;
        }
        .overlay{
            background: rgba(0, 0, 0, 0.5);
            height: 100%;
            width: 100%;
            position: fixed;
            top: 0;
            left: 0;
            z-index: 99999;
            justify-content: center;
            align-items:center;
            border: 0;
            display:none;
        }
        .overlay img {
            width: 31px;
            height: 31px;
        }
    </style>
</head>
<body>
<h1>上传头像</h1>
<div class = "wrapper">
    <span class="user-avatar">用户头像：</span>
    <input type = "file" accept="image/*" capture="camera" id="img" class="input-upload-image"/>
    <img class="upload-btn events-pointer-none" src="http://www.mamicode.com/img_upload.png" id="imgInfo"/>
</div>
<div id="showResult" class="show-result">
</div>
<div class="overlay" id="overlay">
    <img src="http://www.mamicode.com/loading.gif" alt="加载中...">
</div>

<script>
    ‘use strict‘;

    var result1 = ‘‘,result2 = ‘‘,result3 = ‘‘,result4 = ‘‘ ,result5 = ‘‘,result6 = ‘‘ ;

    $(‘img‘).addEventListener(‘change‘, function () {
        $(‘overlay‘).style.display = ‘flex‘;

        var reader = new FileReader();

        reader.onload = function (e) {
            var compressImg = compress( this.result,fileSize);
        };

        reader.readAsDataURL(this.files[0]);

        result1 = this.files[0].size + ‘ Bytes‘;

        var fileSize = Math.round(this.files[0].size/1024/1024) ;
    }, false);

    var compress = function (res,fileSize) {
        var img = new Image(),
                maxW = 200; //设置最大宽度

        img.onload = function () {
            var cvs = document.createElement( ‘canvas‘),
                    ctx = cvs.getContext( ‘2d‘);

            result2 = img.width;
            result3 = img.height;

            if(img.width > maxW) {
                img.height *= maxW / img.width;
                img.width = maxW;
            }

            cvs.width = img.width;
            cvs.height = img.height;

            result4 = cvs.width;
            result5 = cvs.height;

            ctx.clearRect(0, 0, cvs.width, cvs.height);
            ctx.drawImage(img, 0, 0, img.width, img.height);

            var compressRate = getCompressRate(1,fileSize);

            var dataUrl = cvs.toDataURL( ‘image/jpeg‘, compressRate);

            $(‘imgInfo‘).setAttribute(‘src‘,dataUrl);

            $(‘overlay‘).style.display = ‘none‘;

            $(‘showResult‘).innerHTML = "<p>压缩前图片大小为:"+result1+"<br/><p>压缩前图片宽度为:"+result2+"<br/><p>压缩前图片高度为:"+result3+"<br/><p>压缩后图片宽度为:"+result4+"<br/><p>压缩后图片高度为:"+result5+"</p><p class=‘small‘>压缩后的图片大小，可通过nodejs或者后台获取！</p>" ;
        };

        img.src = http://www.mamicode.com/res;
    };

    function getCompressRate(allowMaxSize,fileSize){ //计算压缩比率，size单位为MB
        var compressRate = 1;

        if(fileSize/allowMaxSize > 4){
            compressRate = 0.5;
        } else if(fileSize/allowMaxSize >3){
            compressRate = 0.6;
        } else if(fileSize/allowMaxSize >2){
            compressRate = 0.7;
        } else if(fileSize > allowMaxSize){
            compressRate = 0.8;
        } else{
            compressRate = 0.9;
        }

        result6 = compressRate;

        return compressRate;
    }

    function $(id){
        if(typeof id === ‘string‘ && id.constructor === String){
            return document.getElementById(id);
        }else{
            return;
        }
    }
</script>
</body>
</html>

原文 http://my.oschina.net/zyxchuxin/blog/700381

手机端 H5上传头像


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