原生js制作简单的数字键盘

;(function(exports){
  var KeyBoard = function(input, options){
    var body = document.getElementsByTagName('body')[0];
    var DIV_ID = options && options.divId || '__w_l_h_v_c_z_e_r_o_divid';
    
    if(document.getElementById(DIV_ID)){
      body.removeChild(document.getElementById(DIV_ID));
    }
    
    this.input = input;
    this.el = document.createElement('div');
    
    var self = this;
    var zIndex = options && options.zIndex || 1000;
    var width = options && options.width || '100%';
    var height = options && options.height || '193px';
    var fOntSize= options && options.fontSize || '15px';
    var backgroundColor = options && options.backgroundColor || '#fff';
    var TABLE_ID = options && options.table_id || 'table_0909099';
    var mobile = typeof orientation !== 'undefined';
    
    this.el.id = DIV_ID;
    this.el.style.position = 'absolute';
    this.el.style.left = 0;
    this.el.style.right = 0;
    this.el.style.bottom = 0;
    this.el.style.zIndex = zIndex;
    this.el.style.width = width;
    this.el.style.height = height;
    this.el.style.backgroundColor = backgroundColor;
    
    //样式
    var cssStr = '';
    
    //Button
    var btnStr = '
';
      tableStr += '123';
      tableStr += '456';
      tableStr += '789';
      tableStr += '.0';
      tableStr += '删除';
      tableStr += '';
    this.el.innerHTML = cssStr + btnStr + tableStr;
    
    function addEvent(e){
      var ev = e || window.event;
      var clickEl = ev.element || ev.target;
      var value = clickEl.textContent || clickEl.innerText;
      if(clickEl.tagName.toLocaleLowerCase() === 'td' && value !== "删除"){
        if(self.input){
          self.input.value += value;
        }
      }else if(clickEl.tagName.toLocaleLowerCase() === 'div' && value === "完成"){
        body.removeChild(self.el);
      }else if(clickEl.tagName.toLocaleLowerCase() === 'td' && value === "删除"){
        var num = self.input.value;
        if(num){
          var newNum = num.substr(0, num.length - 1);
          self.input.value = newNum;
        }
      }
    }
    
    if(mobile){
      this.el.Ontouchstart= addEvent;
    }else{
      this.el.Onclick= addEvent;
    }
    body.appendChild(this.el);
  }
  
  exports.KeyBoard = KeyBoard;

})(window);