所以它只允许1到100.所以我不想允许任何字符等.我知道我可以使用ng-pattern等..但我不希望他们甚至添加一个字符所以我必须这样做.

它的工作原理,但我遇到的问题是空间不会触发$解析器,是否有一个解决方法用于触发空间？

app.directive('numericOnly',function(){
    return {
        require: 'ngModel',link: function(scope,element,attrs,modelCtrl) {
            modelCtrl.$parsers.push(function (inputValue) {
 
                //Remove all non numeric values
                var transformedInput = inputValue.replace(/\D/g,'');
 
                //Remove all spaces
                transformedInput = transformedInput.replace(/\s/g,"");
 
                //Remove any leading zero
                if(transformedInput.substring(0,1) === '0') {
                  console.log('is zero');
                  if(transformedInput.length === 1) {
                    transformedInput = '';
                  } else {
                    transformedInput = transformedInput.substring(1,transformedInput.length);
                  }
                }
 
                //Make sure it is not over 100
                var numberCopy = parseInt(transformedInput);
                if(!isNaN(numberCopy)){
                    if(numberCopy > 100) {
                    console.log('bigger than 100');
                    numberCopy = 100;
                    transformedInput = String(numberCopy);
                  }
                 }
 
                //If changes done,then update modelCtrl
                if (transformedInput!=inputValue) {
                    modelCtrl.$setViewValue(transformedInput);
                    modelCtrl.$render();
                }
 
                //Return
                return transformedInput;
            });
        }
    };
});

Plunker：http://plnkr.co/edit/oKXExZ8lkHzUSqHKpm1n?p=preview