类型错误:.substring 不是函数 [英] TypeError: .substring is not a function

问题描述

我正在运行 Acrobat Pro DC.我有一个带有 Action/OnBlur 事件的文本字段(CC.CardNumber")，该事件运行产生此错误的以下脚本.我已经研究了几个小时，但看不出我的代码哪里不正确.

I'm running Acrobat Pro DC. I have a text field ("CC.CardNumber") with an Action/OnBlur event that runs the following script that produces this error. I've researched this for hours and can't see where my code is incorrect.

var fld = this.getField("CC.CardNumber");    
var first = fld.value.substring(0,1);    
fld.value = first; 

TypeError: fld.value.substring 不是函数3:AcroForm:CC.CardNumber:Annot1:OnBlur:Action1Exception in line 1051 of function AFSimple_Calculate, script byteCodeTool

TypeError: fld.value.substring is not a function 3:AcroForm:CC.CardNumber:Annot1:OnBlur:Action1Exception in line 1051 of function AFSimple_Calculate, script byteCodeTool

推荐答案

如果是卡号，则需要将其转换为字符串.

if it is a card number then you need to convert it into a String.

var first = fld.value.toString().substring(0,1);

var first = fld.value.toString().substring(0,1);

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