function reverse1(str){
var a = "";
for(var i = 0; i <= str.length/2; i++){
a = str[i];
str[i] = str[str.length-i-1];
str[str.length-i-1] = a;
}
return str;
}
var str = "abcdef";
reverse1(str);
我想在不使用任何内置函数的情况下反转字符串，我希望它能够更改原始字符串本身，但它不能正常工作。 语言是Javascript。
答案 0 :(得分：2)
这是不使用任何javascript内置函数的最简单方法。
function reverse1(str){
let r = "";
for(let i = str.length-1; i >= 0; i--){
r += str[i];
}
return r;
}
console.log(reverse1("javascript"))
答案 1 :(得分：0)
将forloop迭代从高到低i--反转用于递减i的值
function reverse1(str) {
str = str.trim();
var res ="";
for(var i = str.length-1; i >= 0; i--){
res +=str[i];
}
return res;
}
var str = "abcdef";
console.log(reverse1(str))
答案 2 :(得分：0)
Javascript字符串为immutable，您不能简单地用另一个字符替换字符
function reverse1(str){
var len = str.length, result = "";
for(var i = 0; i <= len-1; i++){
result = result + str[len-i-1];
}
return result;
}
var str = "abcdef";
str = reverse1(str);
console.log(str);
您始终可以创建新字符串并通过
返回答案 3 :(得分：0)
创建一个新字符串并将原始字符串中的所有字符向后添加到其中：
function reverse1(str){
var r = "";
for(var i = str.length - 1; i >= 0; i--){
r += str.charAt(i);
}
return r;
}
然后说：
str = reverse1(str);
答案 4 :(得分：0)
如果您不想在这里使用内置功能，那么
var string = 'hello';
function reverse(str) {
if(!str.trim() || 'string' !== typeof str) {
return;
}
var length=str.length;
s='';
while(length > 0) {
length--;
s+= str[l];
}
return s;
}
console.log(reverse(string));
答案 5 :(得分：0)
import React from "react";
import ReactDOM from "react-dom";
import "antd/dist/antd.css";
import "./index.css";
import {
Anchor,
Button,
Card,
Col,
Descriptions,
Drawer,
Form,
Input,
PageHeader,
Row,
Spin,
Steps
} from "antd";
import { Content } from "antd/es/layout/layout";
const { Step } = Steps;
const { Link } = Anchor;
const renderContent = (column = 3) => (
<Descriptions size="small" column={column}>
<Descriptions.Item label="Book Number">
<a>421421</a>
</Descriptions.Item>
<Descriptions.Item label="Book Number">
{" "}
<a>Avbg Qu</a>
</Descriptions.Item>
<Descriptions.Item label="Book NumberNumber">
<a>2017-01-10</a>
</Descriptions.Item>
<Descriptions.Item label="Book Number">
<a>2017-10-10</a>
</Descriptions.Item>
<Descriptions.Item label="Book Number">
{" "}
<a>Accounts</a>
</Descriptions.Item>
<Descriptions.Item label="Book Number">
{" "}
<a>LPGFH</a>
</Descriptions.Item>
</Descriptions>
);
ReactDOM.render(
<div className={"abs-main-body "}>
<div>
<PageHeader
className="site-page-header-responsive box_shadow margin_bottom_7px "
title="Enter Fixed Asset Details "
>
<Content>{renderContent()}</Content>
</PageHeader>
</div>
<div className={"abs-board-header "}>
<Row gutter={[8, 8]}>
<Col span={12}>
<div className={"ad-side"}>
<Card
title="Current Status"
className="box_shadow"
style={{ flex: 1, width: "100%" }}
>
<Anchor
style={{ width: "100%" }}
showInkInFixed={false}
affix={false}
>
<Steps direction="vertical" size="small" current={1}>
<Step
title={<Link href="#one" title="Invoice Details" />}
description="This is a description."
/>
<Step
title="In Progress"
description="This is a description."
/>
<Step title="Waiting" description="This is a description." />
<Step title="Waiting" description="This is a description." />
<Step title="Waiting" description="This is a description." />
<Step title="Waiting" description="This is a description." />
<Step title="Waiting" description="This is a description." />
<Step title="Waiting" description="This is a description." />
<Step title="Waiting" description="This is a description." />
<Step title="Waiting" description="This is a description." />
<Step title="Waiting" description="This is a description." />
<Step title="Waiting" description="This is a description." />
<Step title="Waiting" description="This is a description." />
</Steps>
</Anchor>
</Card>
</div>
</Col>
<Col span={12}>
<div>
Section-1
<br />
<p>
n publishing and graphic design, Lorem ipsum is a placeholder text
commonly used to demonstrate the visual form of a document or a
typeface without relying on meaningful content. Lorem ipsum may be
used as a placeholder before final copy is available. n publishing
and graphic design, Lorem ipsum is a placeholder text commonly
used to demonstrate the visual form of a document or a typeface
without relying on meaningful content. Lorem ipsum may be used as
a placeholder before final copy is available. n publishing and
graphic design, Lorem ipsum is a placeholder text commonly used to
demonstrate the visual form of a document or a typeface without
relying on meaningful content. Lorem ipsum may be used as a
placeholder before final copy is available.
</p>
</div>
<div>
Section-2
<br />
<p>
n publishing and graphic design, Lorem ipsum is a placeholder text
commonly used to demonstrate the visual form of a document or a
typeface without relying on meaningful content. Lorem ipsum may be
used as a placeholder before final copy is available. n publishing
and graphic design, Lorem ipsum is a placeholder text commonly
used to demonstrate the visual form of a document or a typeface
without relying on meaningful content. Lorem ipsum may be used as
a placeholder before final copy is available. n publishing and
graphic design, Lorem ipsum is a placeholder text commonly used to
demonstrate the visual form of a document or a typeface without
relying on meaningful content. Lorem ipsum may be used as a
placeholder before final copy is available.
</p>
</div>
<div>
Section-3
<br />
<p>
n publishing and graphic design, Lorem ipsum is a placeholder text
commonly used to demonstrate the visual form of a document or a
typeface without relying on meaningful content. Lorem ipsum may be
used as a placeholder before final copy is available. n publishing
and graphic design, Lorem ipsum is a placeholder text commonly
used to demonstrate the visual form of a document or a typeface
without relying on meaningful content. Lorem ipsum may be used as
a placeholder before final copy is available.
</p>
</div>
<div>
Section-4
<br />
<p>
n publishing and graphic design, Lorem ipsum is a placeholder text
commonly used to demonstrate the visual form of a document or a
typeface without relying on meaningful content. Lorem ipsum may be
used as a placeholder before final copy is available. n publishing
and graphic design, Lorem ipsum is a placeholder text commonly
used to demonstrate the visual form of a document or a typeface
without relying on meaningful content. Lorem ipsum may be used as
a placeholder before final copy is available.
</p>
</div>
<div>
Section-5
<br />
<p>
n publishing and graphic design, Lorem ipsum is a placeholder text
commonly used to demonstrate the visual form of a document or a
typeface without relying on meaningful content. Lorem ipsum may be
used as a placeholder before final copy is available. n publishing
and graphic design, Lorem ipsum is a placeholder text commonly
used to demonstrate the visual form of a document or a typeface
without relying on meaningful content. Lorem ipsum may be used as
a placeholder before final copy is available.
</p>
</div>
<div>
Section-6
<br />
<p>
n publishing and graphic design, Lorem ipsum is a placeholder text
commonly used to demonstrate the visual form of a document or a
typeface without relying on meaningful content. Lorem ipsum may be
used as a placeholder before final copy is available. n publishing
and graphic design, Lorem ipsum is a placeholder text commonly
used to demonstrate the visual form of a document or a typeface
without relying on meaningful content. Lorem ipsum may be used as
a placeholder before final copy is available. n publishing and
graphic design, Lorem ipsum is a placeholder text commonly used to
demonstrate the visual form of a document or a typeface without
relying on meaningful content. Lorem ipsum may be used as a
placeholder before final copy is available.
</p>
</div>
<div id="one">
Section-7
<br />
<p>
n publishing and graphic design, Lorem ipsum is a placeholder text
commonly used to demonstrate the visual form of a document or a
typeface without relying on meaningful content. Lorem ipsum may be
used as a placeholder before final copy is available. n publishing
and graphic design, Lorem ipsum is a placeholder text commonly
used to demonstrate the visual form of a document or a typeface
without relying on meaningful content. Lorem ipsum may be used as
a placeholder before final copy is available. n publishing and
graphic design, Lorem ipsum is a placeholder text commonly used to
demonstrate the visual form of a document or a typeface without
relying on meaningful content. Lorem ipsum may be used as a
placeholder before final copy is available.v
</p>
</div>
</Col>
</Row>
</div>
</div>,
document.getElementById("container")
);
答案 6 :(得分：-2)
我认为这个问题更好的答案是here。为什么char不能改变立场。
function reverse(s){
return s.split("").reverse().join("");
}
var originalString = "ABCD";
console.log(reverse(originalString));
console.log(originalString);
originalString = reverse(originalString);
console.log(originalString);