input标签只能输入数字JQuery控制

<input type="text" id="txt1">  

<script type="text/javascript">  
  $("#txt1").numeral();   
 </script>

 

$.fn.numeral = function(){   
            $(this).css("ime-mode","disabled");   
            this.bind("keypress",function(){   
                if(event.keyCode == 46){   
                    if(this.value.indexOf(".")!=-1){   
                        return false;   
                    }   
                }else{   
                    return event.keyCode>=46&&event.keyCode<=57;   
                }   
            });   
            this.bind("blur",function(){   
                if(this.value.lastIndexOf(".")==(this.value.length-1)){   
                    this.value = this.value.substr(0,this.value.length-1);   
                }else if(isNaN(this.value)){   
                    this.value = "";                       
                }   
            });   
            this.bind("paste",function(){   
                var s=clipboardData.getData('text');    
                if(!/\D/.test(s));    
                value=s.replace(/^0*/,'');    
                return false;   
            });   
            this.bind("dragenter",function(){   
                return false;   
            });   
            this.bind("keyup",function(){   
                if(/(^0+)/.test(this.value))this.value=this.value.replace(/^0*/, '');   
            });   
        };