Javascript var.replace 不是函数
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var.replace is not a function
提问by Brett
I'm using the below code to try to trim the string in Javascript but am getting the error mentioned in the title:
我正在使用以下代码尝试在 Javascript 中修剪字符串，但出现标题中提到的错误：
function trim(str) {
return str.replace(/^\s+|\s+$/g,'');
}
Edit:
编辑：
I fixed the problem.... sorry I should have put the code on how I was calling it too.... realized I accidentally was passing the object of the form field itself rather than its value.
我解决了这个问题......抱歉，我应该把代码放在我如何调用它上......意识到我不小心传递了表单字段本身的对象而不是它的值。
回答by ClosureCowboy
My guess is that the code that's calling your trimfunction is notactually passing a string to it.
我的猜测是调用您的trim函数的代码实际上并没有将字符串传递给它。
To fix this, you can make stra string, like this: str.toString().replace(...)
...as alperpointed out below.
要解决此问题，您可以创建str一个字符串，如下所示：str.toString().replace(...)
...正如alper在下面指出的那样。
回答by T.Todua
probable issues:
可能的问题：
- variable is NUMBER(instead of string);
num=35; num.replace(3,'three'); =====> ERRORnum=35; num.toString().replace(3,'three'); =====> CORRECT !!!!!!num='35'; num.replace(3,'three'); =====> CORRECT !!!!!! - variable is object(instead of string);
- variable is not defined;
- 变量是NUMBER（而不是字符串）；
num=35; num.replace(3,'three'); =====> ERRORnum=35; num.toString().replace(3,'three'); =====> CORRECT !!!!!!num='35'; num.replace(3,'three'); =====> CORRECT !!!!!! - 变量是对象（而不是字符串）；
- 变量未定义；
回答by Kareem
Replace wouldn't replace numbers. It replaces strings only.
替换不会替换数字。它只替换字符串。
This should work.
这应该有效。
function trim(str) {
return str.toString().replace(/^\s+|\s+$/g,'');
}
If you only want to trim the string. You can simply use "str.trim()"
如果您只想修剪字符串。您可以简单地使用“str.trim()”
回答by meder omuraliev
You are not passing a string otherwise it would have a replacemethod. I hope you didnt type function trim(str) { return var.replace(blah); }instead of return str.replace.
您没有传递字符串，否则它会有一个replace方法。我希望你没有输入function trim(str) { return var.replace(blah); }而不是return str.replace.
回答by gion_13
You should probably do some validations before you actually execute your function :
在实际执行函数之前，您可能应该进行一些验证：
function trim(str) {
if(typeof str !== 'string') {
throw new Error('only string parameter supported!');
}
return str.replace(/^\s+|\s+$/g,'');
}
回答by Dave Vogt
Did you call your function properly? Ie. is the thing you pass as as a parameter really a string?
你是否正确调用了你的函数？IE。你作为参数传递的东西真的是一个字符串吗？
Otherwise, I don't see a problem with your code - the example below works as expected
否则，我看不出您的代码有问题 - 下面的示例按预期工作
function trim(str) {
return str.replace(/^\s+|\s+$/g,'');
}
trim(' hello '); // --> 'hello'
However, if you call your functoin with something non-string, you will indeed get the error above:
但是，如果你用非字符串的东西调用你的functoin，你确实会得到上面的错误：
trim({}); // --> TypeError: str.replace is not a function
回答by J.C. Gras
In case of a number you can try to convert to string:
如果是数字，您可以尝试转换为字符串：
var stringValue = str.toString();
return stringValue.replace(/^\s+|\s+$/g,'');
回答by user6619380
You should use toString() Method of java script for the convert into string before because replace method is a string function.
之前应该使用java脚本的toString()方法转换成字符串，因为replace方法是一个字符串函数。
回答by Brett
I fixed the problem.... sorry I should have put the code on how I was calling it too.... realized I accidentally was passing the object of the form field itself rather than it's value.
我解决了这个问题......抱歉，我应该把代码放在我如何调用它上......意识到我不小心传递了表单字段本身的对象而不是它的值。
Thanks for your responses anyway. :)
无论如何，感谢您的回复。:)
