js字符串去除指定字符

Question

我这样去为什么去不掉'[',']'

let str1 = JSON.stringify(this.checkboxGroupFrom)//[1,2,3,4,6,7]
typeof(str1)
str1.replace("[","")
str1.replace("]","")
console.log(str1)

Answer 1

上面这些哥们都没回答到重点，replace 不会改变原来的字符串，而是会产生一个新的字符串。

mdn 文档这样定义的：

参考链接：https://developer.mozilla.org...

况且你要拿到数组里面的每个分量根本不用这样做啊，直接用 join 方法：

参考链接：https://developer.mozilla.org...

Answer 2

this.checkboxGroupFrom = [1,2,3,4,6,7]
str1 = this.checkboxGroupFrom.join(',') //1,2,3,4,5,6,7
str2 = this.checkboxGroupFrom.join('') //1234567

Answer 3

let str1 = JSON.stringify(this.checkboxGroupFrom)//[1,2,3,4,6,7]
typeof(str1)
str1 = str1.replace("[","")
str1 = str1.replace("]","")
console.log(str1)

// 缺少赋值

Answer 4

这是typescript吗？

let str1 = JSON.stringify(this.checkboxGroupFrom)//[1,2,3,4,6,7]
typeof(str1)
let st2=str1.replace("[","")
let st3=st2.replace("]","")
console.log(st3);

不过建议你用正则表达式 str1.replace(/[\[\]]/g,'');

Answer 5

缺少赋值 str1=str1.replace(']','')个人觉得用3楼方法的更好

Answer 6

let str1 = JSON.stringify(this.checkboxGroupFrom);
let str = /^\[(.*?)\]$/.exec(str1)[1];
console.log(str);

Answer 7

replace 会返回一个新的字符串而不会改变原有字符串，所以你那样写肯定就不会得到想要的结果。

Answer 8

this.checkboxGroupFrom = [1,2,3,4,5,6,7];
        let str1 = JSON.stringify(this.checkboxGroupFrom);//[1,2,3,4,6,7]
        console.log(typeof(str1));
        let str = str1.substr(1);
        let strNew = str.substr(0,str.length-1);
        console.log(strNew);

this.checkboxGroupFrom = [1,2,3,4,5,6,7];
        let str1 = JSON.stringify(this.checkboxGroupFrom);//[1,2,3,4,6,7]
        console.log(typeof(str1));
        let str = str1.replace("[","");
        let strNew = str.replace("]","");
        console.log(strNew);

试试这两个