this.config = {

inputElem : '.inputElem',// 输入框目标元素
parentCls : '.parentCls',// 目标元素的父类
align : 'right',// 对齐方式有 ['top','bottom','left','right']四种 默认为top
splitType : [3,4],// 拆分规则
delimiter : '-' // 分隔符可自定义
};

this.cache = {
isFlag : false
};
this.init(options);
}

TextMagnifier.prototype = {

constructor: TextMagnifier,init: function(options) {
this.config = $.extend(this.config,options || {});
var self = this,_config = self.config,_cache = self.cache;

self._bindEnv();

},/*

• 在body后动态添加HTML内容
• @method _appendHTML
  */
  _appendHTML: function($this,value) {
  var self = this,_cache = self.cache;

var html = '',$parent = $($this).closest(_config.parentCls);

if($('.js-max-input',$parent).length == 0) {
html += '<div class="js-max-input"&gt;</div>';
$($parent).append(html);
}
var value = self._formatStr(value);
$('.js-max-input',$parent).html(value);

},/*

• 给目标元素定位
• @method _position
• @param target
  */
  _position: function(target){
  var self = this,_config = self.config;
  var elemWidth = $(target).outerWidth(),elemHeight = $(target).outerHeight(),elemParent = $(target).closest(_config.parentCls),containerHeight = $('.js-max-input',elemParent).outerHeight();

$(elemParent).css({"position":'relative'});

switch(true){

case _config.align == 'top':

$('.js-max-input',elemParent).css({'position':'absolute','top' :-elemHeight - containerHeight/2,'left':0});
break;

case _config.align == 'left':

$('.js-max-input','top' :0,'left':0});
break;

case _config.align == 'bottom':

$('.js-max-input','top' :elemHeight + 4 + 'px','left':0});
break;

case _config.align == 'right':

$('.js-max-input','left':elemWidth + 2 + 'px'});
break;

}
},/**

• 绑定事件
• @method _bindEnv
  */
  _bindEnv: function(){
  var self = this,_cache = self.cache;

// 实时监听输入框值的变化
$(_config.inputElem).each(function(index,item){

$(item).keyup(function(e){
var value = $.trim(e.target.value),parent = $(this).closest(_config.parentCls);
if(value == '') {
self._hide(parent);
}else {

 var html = $.trim($('.js-max-input',parent).html());

 if(html != '') {
  self._show(parent);
 }
}
self._appendHTML($(this),value);
self._position($(this));

});

$(item).unbind('focusin');
$(item).bind('focusin',function(){
var parent = $(this).closest(_config.parentCls),html = $.trim($('.js-max-input',parent).html());

if(html != '') {
 self._show(parent);
}

});

$(item).unbind('focusout');
$(item).bind('focusout',function(){
var parent = $(this).closest(_config.parentCls);
self._hide(parent);
});
});
},/**

• 格式化下
• @method _formatStr
  /
  _formatStr: function(str){
  var self = this,_cache = self.cache;
  var count = 0,output = [];
  for(var i = 0,ilen = _config.splitType.length; i < ilen; i++){
  var s = str.substr(count,_config.splitType[i]);
  if(s.length > 0){
  output.push(s);
  }
  count+= _config.splitType[i];
  }
  return output.join(_config.delimiter);
  },/
• 显示 放大容器
• @method _show
  /
  _show: function(parent) {
  var self = this,_cache = self.cache;
  if(!_cache.isFlag) {
  $('.js-max-input',parent).show();
  _cache.isFlag = true;
  }
  },/
• 隐藏 放大容器
• @method hide
• {public}
  */
  _hide: function(parent) {
  var self = this,_cache = self.cache;
  if(_cache.isFlag) {
  $('.js-max-input',parent).hide();
  _cache.isFlag = false;
  }
  }
  };