var ImagePlayer = function(options) {  this.control = options.control;  this.image = options.image;  this.STOP_TEXT = '停止';  this.PLAY_TEXT = '开始';  this.drawFirstFrame = function() {};  this.stop = function() {    if (!this.baseUrl) {      this.baseUrl = this.image.src;    }    var canvas = document.createElement('canvas');    var width = this.image.width;    var height = this.image.height;    if (width && height) {      canvas.width = width;      canvas.height = height;      canvas.getContext('2d').drawImage(this.image, 0, 0, width, height);      try {        this.firstFrame = canvas.toDataURL('image/gif');      } catch (e) {        this.image.removeAttribute('src');        canvas.style.position = 'absolute';        this.image.parentElement.insertBefore(canvas, this.image);        this.image.style.opacity = '0';        this.storeCanvas = canvas;      }    }  };  this.play = function() {    if (this.storeCanvas) {      this.storeCanvas.parentElement.removeChild(this.storeCanvas);      this.storeCanvas = null;      this.image.style.opacity = '';    }    if (this.baseUrl) {      this.image.src = this.baseUrl;    }  };  this.handleControl = function() {    if (this.control.value === this.STOP_TEXT) {      this.stop();      this.control.value = this.PLAY_TEXT;    } else {      this.play();      this.control.value = this.STOP_TEXT;    }  };  this.initEvent = function() {    this.control.addEventListener('click', this.handleControl.bind(this), false);  };  this.init = function() {    this.initEvent();  };  this.init();};