选择数字然后格式化为2位小数

I am trying to write some code that will do the following;

我正在尝试编写一些代码来执行以下操作;

Add an ID to nth child

为第n个孩子添加ID

Format the number in nth child to 2 decimal places

将第n个孩子的数字格式化为2个小数位

Apply £ in front of the numbers

在数字前面应用£

Loop until every nth child in a table is done

循环直到表中的每个第n个孩子都完成

I have numbers such as this to round of “0.7823076923076923” using the code I have I can get it to round up to "1" but I need it to round to 0.78 I then added “toFixed(2)” and it takes my “1” and puts it to “1.00” but I need It to go to “0.78” once I have that in place I can then look at how I can loop the code, but small steps.

我有这样的数字到圆形“0.7823076923076923”使用我有的代码我可以得到它向上舍入到“1”但我需要它来舍入到0.78我然后添加“toFixed(2)”它需要我的“ 1“并将其置于”1.00“但我需要它到”0.78“一旦我有了它,我可以看看如何循环代码,但小步骤。

Thanks for all the help.

谢谢你的帮助。

Code:

<script>
$(document).ready(function(){
    $('table>tbody>tr>td:nth-child(5n)').prop('id', 'test');
    $('#test').text(function(i,v) {
        return Math.round(parseInt(v * 100) / 100).toFixed(2);
    });
});
</script>

UPDATE i got it working!!!

更新我让它工作!

    $(document).ready(function(){
    $('table>tbody>tr>td:nth-child(5n)').prop('id', 'test');
    var test = parseFloat($('#test').text()).toFixed(2);
    $('table>tbody>tr>td:nth-child(5n)').empty().append(test);
});

now to make it loop,

现在让它循环,

Thanks for all the help.

谢谢你的帮助。

1 个解决方案

#1

To round a number to n decimal places:

要将数字舍入到n个小数位:

var n = 2;
var number = 0.7823076923076923;
var result = Math.round(number * Math.pow(10,n)) / Math.pow(10,n);
result = result.toFixed(n);

UPDATE:

For a more reusable option, you can define a custom rounding function:

对于更可重用的选项,您可以定义自定义舍入功能:

function roundTo (value, n) {
    var result = Math.round(value * Math.pow(10,n)) / Math.pow(10,n);
    return result.toFixed(n);
}

var foo = roundTo(0.7823076923076923, 2); // 0.78

#1