如何在迭代循环中连接字符串

Question

我的输出是

1

1

2

1

2

3

…

我正在寻找的输出是

1 1 2 1 2 3 1 2 3 4 1 2 3 4 5

var x,y;

for(x=1; x <= 5; x++){

    for (y=1; y <= x; y++) {

        console.log(y)

    }

}

Answer 1

您可以使用一个部分变量和一个完整字符串的单个循环。然后，仅当字符串不为空时才需要添加一个空格，并在每个循环中将新值和实际部分添加到完整字符串中。var i,&nbsp; &nbsp; part = '',&nbsp; &nbsp; full = '';&nbsp; &nbsp;&nbsp;for (i = 1; i <= 5; i++) {&nbsp; &nbsp; part += (part && ' ') + i;&nbsp; &nbsp; full += (full && ' ') + part;}console.log(full);

Answer 2

这应该适合你：var x, y, concatenatedString = '';for(x = 1; x <= 5; x++) {&nbsp; &nbsp; for (y=1; y <= x; y++) {&nbsp; &nbsp; &nbsp; &nbsp; concatenatedString += `${y} `&nbsp; &nbsp; }}console.log(concatenatedString)

Answer 3

试试下面的片段：var str = ''for (let i = 1; i <= 5; i++) {&nbsp; for (let j = 1; j <= i; j++) {&nbsp; &nbsp; str += `${j} `&nbsp; }}console.log(str)