Question

.toFixed（2）。

我的工作正常，我得到了准确的答案。

        var la_95_m = document.getElementById("la_95_charge_m");
la_95_m.value = (((total_current_storage.value / total_current_draw_30.value) / cd5_factor) * bc_95_sd_ad) * new_old_factor;

我需要包装＆＃34; var la_95_m＆＃34;使用toFixed（2）但无论我怎么试过它，我都会打破脚本。

所有这些

var la_95_m.toFixed(2);

var la_95_m.value.toFixed(2);

var la_95_m.toFixed(2) = document.getElementById("la_95_charge_m");
                    la_95_m.value = (((total_current_storage.value / total_current_draw_30.value) / cd5_factor) * bc_95_sd_ad) * new_old_factor;

打破它。

感谢任何提示/帮助

Answer 1

您无法声明变量的类型为.toFixed()，因此请参阅：

var la_95_m.toFixed(2)

将不工作。

您需要在计算结果上调用.toFixed(2)：

var result = (((total_current_storage.value / total_current_draw_30.value) / cd5_factor) * bc_95_sd_ad) * new_old_factor;
la_95_m.value = result.toFixed(2);

result包含数值，result.toFixed(2)返回一个字符串，该字符串是带有两个小数位的数字。（如果result 不数字，则会收到错误。）

要在不创建额外result变量的情况下执行此操作，请将计算括在括号中并在其上调用.toFixed(2)：

la_95_m.value = (someExpressionThatIsNumeric).toFixed(2);

la_95_m.value = ((((total_current_storage.value / total_current_draw_30.value) / cd5_factor)
                 * bc_95_sd_ad) * new_old_factor).toFixed(2);

Answer 2

将// first load your new data to your picker view's data source (not shown here...) then load the data into the picker view using it's delegate [self.fieldPicker reloadAllComponents]; // now that the data is loaded, select a row in the picker view through it's delegate [self.fieldPicker selectRow:([self.theFields count] - 1) inComponent:0 animated:NO]; // retrieve the row selected in the picker view to use in setting data from your data source in textboxes etc. long row = (long)[self.fieldPicker selectedRowInComponent: 0];更改为var la_95_m.toFixed(2);。

la_95_m.value = la_95_m.value.toFixed(2);实际上并没有更改您调用它的号码的值，它只返回一个包含n位的新字符串。

限制到2个地方，tofixed不工作

2 个答案: