使用<input type =“text”for =“”calculator =“”input =“”而不是=“”=“”<input =“”type =“number”

Answer 1

关于活动onclick＆＃39;或者＆＃39; onsubmit＆＃39;或者＆＃39; onblur＆＃39;发生在提交按钮上，你调用一个javascript函数将它们转换为数值。

我建议你去了解javascript。

 1) how read the value of the DOM element of your input field.
 2)How to remove/(or replace with null) the characters except numbers from variable.(learn about regular expression in string replace/remove)
 3) how to writes the value of variable to teh DOM element (Your's input field)

在提交表格之前这样做。

您可以参考How to make HTML input tag only accept numerical values?

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