js百分数与小数互相转换

	        //百分数转化为小数
		//1.先去掉百分号
		//2.再除以100
		//3.返回出去
		
		var percent = "4.2%";//申明要放在函数前
		function toPoint(percent){
   		 	var str=percent.replace("%","");
    		        str= str/100;
   		 	return str;
		}
		toPoint(percent);
		var result = toPoint(percent);
		document.write(result);//0.042
		
		//小数转化为分数
		//1.先转化为number类型
		//2.再乘以100
		//3.保留小数位
		var point = 0.042;
		function toPercent(point){
			var percent = Number(point*100).toFixed(1);
			percent+="%";
			return percent;
		}
	  	 var result = toPercent(point);
		document.write("<br/>"+result);