用jquery实现的文本框只能输入数字

用jquery实现的文本框只能输入数字简单插件

$.fn.numeral = function() {
  $(this).css("ime-mode", "disabled");
  this.bind("keypress",function(e) {
    var e = e||event;
    var currKey = e.keyCode||e.which||e.charCode;
    if (currKey == 46) {
        if (this.value.indexOf(".") != -1) {
            return false;
        }
    }else {
        return currKey >= 46 && currKey <= 57 || currKey == 8;
    }
  });
  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 = "0";
      }
  });
  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*/, '');
      }
  });
};