日期格式化函数封装 && 类名获取元素兼容封装

//将日期格式化输出 “2015-08-24”
	format:function(date,sp){
		
		sp = sp || '|';
		date = date || (new Date)
		
		var y = date.getFullYear();
		var m = date.getMonth()+1;
		
		
		var d = date.getDate();
		if(m <10){
			m = '0' + m;
		}
		if(d<10){
			d='0'+d;
		}
		return y+sp+m+sp+d
	}


//通过类名获取 元素 
function getElementsByClassName(className){
				console.log()
				if(document.getElementsByClassName){
					 return document.getElementsByClassName(className);
				}else{
					//低版本ie    undefined
					//document.getElementsByClassName
					var arr = [];
					
					var eles = document.getElementsByTagName('*');
					for(var i=0;i<eles.length;i++){
						var ele = eles[i];
						//class 是关键字 
						
						if(ele.className.indexOf(className) !=-1){
							console.log(ele.className)
							arr.push(ele)
							
						}
						
					}
					
					return arr;
					
				}
			}