你可以使用 ^ 否定字符类：

You can use character class with ^ negation:

this.value = this.value.replace(/[^a-zA-Z0-9_-]/g,'');

测试：

console.log('Abc054_34-bd'.replace(/[^a-zA-Z0-9_-]/g,'')); // Abc054_34-bd
console.log('Fš 04//4.'.replace(/[^a-zA-Z0-9_-]/g,'')); // F044

所以把字符放在 [^ ...] ，您可以决定应该允许哪些字符以及所有其他字符替换。

So by putting characters in [^...], you can decide which characters should be allowed and all others replaced.