js 格式化数字保留2位小数

function toDecimal2(x) { 
var f = parseFloat(x); 
if (isNaN(f)) { 
return false; 
} 
var f = Math.round(x*100)/100; 
var s = f.toString(); 
var rs = s.indexOf('.'); 
if (rs < 0) { 
rs = s.length; 
s += '.'; 
} 
while (s.length <= rs + 2) { 
s += '0'; 
} 
return s; 
}

 

//-------调用

var val;
val=obj[i].value.replace('[','');
val=val.replace(']','');    
var arr= val.split(',');

var v1 = toDecimal2(arr[0]);