javascript - 有没有办法在迭代字符串时检测新行？

Question

假设我有一个像这样的输入字符串:

var str = "hello i am a
robot, have a 
nice day";

我正在像这样迭代字符串:

let newTxt: string = "";
for (var i = 0; i < str.length; i++) {
    if (str[i] == "\n") {
        // i want something like that...
        console.log("new line detected!");
    }
    newTxt += str[i];
}

我知道可以使用 Regex 检测新行，但我需要在迭代字符串时进行检测。 有没有办法在循环执行时检测新行？

Answer 1

是的，但是:

var str = "hello i am a
robot, have a 
nice day";

语法无效。

任一转义(不会创建 '\n'):

var str = "hello i am a\
robot, have a \
nice day";

或者使用模板字符串(创建'\n'):

var str = `hello i am a
robot, have a 
nice day`;

当然，如果您自己声明了 \n，您也可以使用 ":

var str = "hello i am a\nrobot, have a\nnice day";

否则您的代码没问题。

模板字符串演示(删除了 newTxt: string 中的类型，以便您可以在此处运行它):

var str = `hello i am a
robot, have a 
nice day`;

let newTxt = "";
for (var i = 0; i < str.length; i++) {
    if (str[i] == "\n") {
        // i want something like that...
        console.log("new line detected!");
    }
    newTxt += str[i];
}

带有转义的演示(注意它永远不会打印检测到新行!):

var str = `hello i am a\
robot, have a \
nice day`;

let newTxt = "";
for (var i = 0; i < str.length; i++) {
    if (str[i] == "\n") {
        // i want something like that...
        console.log("new line detected!");
    }
    newTxt += str[i];
}