jQuery.fn.extend({
  numInput: function(opt){
    var defaultOptions = {
      width: 100,
      wrapperClass: 'num-input-wrap',
      inputClass: 'num-input',
      addClass: 'add',
      subtractClass: 'subtract',
      positive: true,
      negative: true,
      floatCount: 2
    };
    var options = jQuery.extend(defaultOptions, opt);
    this._initNumDom(options);
  },
  _initNumDom: function(opt){
    for (var i = 0,len = this.length; i < len; i++) {
      var wrapper = $('<div class="'+opt.wrapperClass+'"></div>');
      wrapper.css({"position": "relative", "display": "inline-block", "vertical-align": "top", "height": 32, "width": opt.width, "border": "1px solid #ccc", "border-radius": 6, "box-sizing": "border-box", "overflow": "hidden"});
      console.log;
      $(this[i]).append(wrapper);
      var inputN = $('<input type="text" class="'+opt.inputClass+'"/>');
      inputN.css({"height": 30, "width": "100%", "padding": "0 25px 0 12px", "font-size": "14px", "line-height": "30px", "background": "#fff", "box-shadow": "inset 0 1px 1px rgba(0,0,0,.075)", "box-sizing": "border-box", "border": "none"});
      var addBtn = $('<span class="'+opt.addClass+'"></span>');
      addBtn.css({"position": "absolute", 'right': 0, 'top': 0, 'width': 25, "height": 15, "border-left": "1px solid #ccc", "box-sizing": "border-box", "cursor": "pointer"});
      var subtractBtn = $('<span class="'+opt.subtractClass+'"></span>');
      subtractBtn.css({"position": "absolute", 'right': 0, 'bottom': 0, 'width': 25, "height": 15, "border-left": "1px solid #ccc", "box-sizing": "border-box", "cursor": "pointer"});
      wrapper.append(inputN).append(addBtn).append(subtractBtn);
      this._initNumEvent(inputN, addBtn, subtractBtn, opt)  
    } 
    $('<style type="text/css">.add:hover,.subtract:hover{background: #d8d8d8;}.add.deep,.subtract.deep{background: #b3b3b3;}.add::after{position: absolute;left: 8px;top: 5px;content: "";border-left: 4px solid transparent;border-right: 4px solid transparent;border-bottom: 6px solid #333;}.subtract::after{position: absolute;left: 8px;bottom: 5px;content: "";border-left: 4px solid transparent;border-right: 4px solid transparent;border-top: 6px solid #333;}</style>').appendTo('head');
  },
  _initNumEvent: function(it, ab, sb, opt){
    var countDown,quickChange;
    ab.on('mousedown', function(){
      $(this).addClass('deep');
      var val = parseFloat($(this).prevAll('input').val());
      val = isNaN(val) ? 0 : val;
      val++;
      if(val > 0 && !opt.positive){
        val = 0;
      }else if(val < 0 && !opt.negative){
        val = 0;
      }
      val = Math.round(val*Math.pow(10, opt.floatCount))/Math.pow(10, opt.floatCount);
      it.val(val);
      countDown = setTimeout(function(){
        quickChange = setInterval(function(){
          var val = parseFloat(it.val());
          val++;
          if(val > 0 && !opt.positive){
            clearTimeout(countDown);
            clearInterval(quickChange);
            val = 0;
          }
          val = Math.round(val*Math.pow(10, opt.floatCount))/Math.pow(10, opt.floatCount);
          it.val(val);
        },30)
      },500)
    });
    ab.on('mouseup', function(){
      $(this).removeClass('deep');
      if(countDown){
        clearTimeout(countDown);
      }
      if(quickChange){
        clearInterval(quickChange);
      }
    });
    sb.on('mousedown', function(){
      $(this).addClass('deep');
      var val = parseFloat($(this).prevAll('input').val());
      val = isNaN(val) ? 0 : val;
      val--;
      if(val < 0 && !opt.negative){
        val = 0;
      }else if(val > 0 && !opt.positive){
        val = 0;
      }
      val = Math.round(val*Math.pow(10, opt.floatCount))/Math.pow(10, opt.floatCount);
      it.val(val);
      countDown = setTimeout(function(){//长按半秒触发快速加减
        quickChange = setInterval(function(){
          var val = parseFloat(it.val());
          val--;
          if(val < 0 && !opt.negative){
            clearTimeout(countDown);
            clearInterval(quickChange);
            val = 0;
          }
          val = Math.round(val*Math.pow(10, opt.floatCount))/Math.pow(10, opt.floatCount);
          it.val(val);
        },30)
      },500)
    });
    sb.on('mouseup', function(){
      $(this).removeClass('deep');
      if(countDown){
        clearTimeout(countDown);
      }
      if(quickChange){
        clearInterval(quickChange);
      }
    });
    it.on('keyup',function(){
      var val = $(this).val();
      if((opt.positive&&opt.negative)||(!opt.positive&&!opt.negative)){
        var reg = new RegExp('^\D*(-?(([1-9]\\d*)?|([0]))?(\\.\\d{0,'+opt.floatCount+'})?)?.*$', 'g');
      }else if(!opt.positive&&opt.negative){
        var reg = new RegExp('^(-(([1-9]\\d*)?|([0]))?(\\.\\d{0,'+opt.floatCount+'})?)?.*$', 'g');
      }else if(opt.positive&&!opt.negative){
        var reg = new RegExp('^\D*(([1-9]\d*)?|([0]))?(\.\d{0,'+opt.floatCount+'})?)?.*$', 'g');
      }
      val = val.replace(reg,'$1');
      if((val.indexOf('.')==-1||(val.indexOf('.')+1) < val.length)&&val.indexOf('-')==-1){
        val = parseFloat(val);
        val = isNaN(val) ? '' : val;
      }
      $(this).val(val)  ;
    })
  }
});