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js 数字保留2位小数

//格式化小数
function formatTwo(x) {
var f_x = parseFloat(x);
if (isNaN(f_x)) {
alert('function:formatTwo->parameter error');
return false;
}
var f_x = Math.round(x * 100) / 100;
var s_x = f_x.toString();
var pos_decimal = s_x.indexOf('.');
if (pos_decimal < 0) {
pos_decimal = s_x.length;
s_x += '.';
}
while (s_x.length <= pos_decimal + 2) {
s_x += '0';
}
return s_x;
}