处理用户头像的上传

 
(function () {
    "use strict";
    var configMap = {
        maxSize: 200000,
        inputName: 'user_avatar',
        acceptType: 'images/*'
    };
    var inputFile;
  
    function init(opts) {
        inputFile = document.createElement('input');
        inputFile.type = 'file';
        inputFile.name = opts.name || configMap.inputName;
        inputFile.style.display = 'none';
        inputFile.accept = opts.acceptType || configMap.acceptType;
        document.body.appendChild(inputFile);
    }
  
    inputFile.onchange = function () {
        if (inputFile.files[0].size <= configMap.maxSize) {
            reader.readAsDataURL(inputFile.files[0]);
        } else {
  
        }
    };
  
    var reader = new FileReader();
    reader.onload = function () {
        // reader.result
    };
})();