myApp.directive('price', function($parse) {
 return {
  link: function (scope, element, attrs, ctrl) {
    //控制輸入框只能輸入數(shù)字和小數(shù)點
    function limit(){
      var limitV=element[0].value;
      limitV=limitV.replace(/[^0-9.]/g,"");
      //處理0開頭的整數(shù)
      if ((/^0+[0-9]+$/).test(limitV)) {
        limitV=limitV.replace(/\b(0+)/gi,"");
      }
      //限定小數(shù)點后的位數(shù)
      var digits = attrs['digits']?Number(attrs['digits']):2;
      if (limitV*Math.pow(10,digits)%1!=0) {
        var index = limitV.indexOf('.');
        var last = index+digits+1;
        limitV = (""+limitV).substring(0,last);
      }
      element[0].value=limitV;
      $parse(attrs['ngModel']).assign(scope, limitV);
      format();
    }
    //對輸入數(shù)字的整數(shù)部分插入千位分隔符
    function format(){
      var formatV=element[0].value;
      var array=new Array();
      array=formatV.split(".");
      var re=/(-?\d+)(\d{3})/;
      while(re.test(array[0])){
        array[0]=array[0].replace(re,"$1,$2")
      }
      var returnV=array[0];
      for(var i=1;i<array.length;i++){
        returnV+="."+array[i];
      }
      element[0].value=returnV;
      $parse(attrs['ngModel']).assign(scope, formatV);
    }
    scope.$watch(attrs.ngModel,function(){
      limit();
    })
  }
 };
})

<input ng-model="money" price digits="1"/>