ico_hash.html

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>计算icon_hash</title>
    <script src="murmurhash3.min.js"></script>
</head>
<body>
    <h3>选择icon文件:<h3>
    <input type="file" id="fielinput"/>
    <br><br><br>
    <div>icon_hash:<span id="hash"></span></div>

    <script>
        window.onload = function () {
            var input = document.getElementById("fielinput");
            if (typeof (FileReader) === 'undefined') {
                console.log("你的浏览器不支持 FileReader");
                input.setAttribute('disabled', 'disabled');
            } else {
                input.addEventListener('change', parseFileToBase64, false);
            }
        }
        
        function parseFileToBase64() {
            // 获取到文件对象
            var file = this.files[0];
            console.log("file是："+this.files[0]);
            // 获取FileReader实例
            var reader = new FileReader();
            // 将文件加载进入
            reader.readAsDataURL(file);
            reader.onload = function (e) {
                var insertIntervalString = (originStr, disNum = 10, insertStr = "\n") => originStr.replace(new RegExp("(.{" + disNum + "})", "g"), "$1" + insertStr);
                var newstr = insertIntervalString(this.result.slice(25), 76, "\n")+'\n';
                // 输出该文件的base64编码，调用mmh3计算icon_hash
                murmurhash3_32(newstr)
            }
        }

        function murmurhash3_32(str) {
            var seed = 0;
            var hash = MurmurHash3.hashBytes (str, str.length, seed);
            document.getElementById('hash').innerText = hash;
        }
    </script>
</body>
</html>