限制字符串的长度

JS

window.onload = function(){
	var limitLength = document.getElementById("limitLength"),		//获取限制对象
			clearNonumber = function(tThis){					//清除数字
				var _v = tThis.value,
						_vLen = _v.length,
						dataLength = tThis.getAttribute("data-length"),//获取长度属性
				dataModel = tThis.getAttribute("data-model"),
				subLen = dataLength;
				if(_vLen > dataLength)  tThis.value = _v.substr(0, subLen);//判断长度
				if(remainingCharacters){
					self.showRemainingCharacters(!_vLen ? dataLength :(_vLen > 
dataLength ? 0 :dataLength - _vLen), remainingCharacters);
				}
			};
	limitLength.onfocus = function(){							//获取焦点事件
		clearNonumber(this);
	}
	limitLength.onkeyup = function(){							//键盘事件
		clearNonumber(this);
	}
	limitLength.onblur = function(){							//失去焦点事件
		clearNonumber(this);
	}
};