在特定索引处插入字符串 [英] Insert a string at a specific index
本文介绍了在特定索引处插入字符串的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何在另一个字符串的特定索引处插入字符串?
How can I insert a string at a specific index of another string?
var txt1 = "foo baz"
假设我想在foo之后插入bar我该如何实现?
Suppose I want to insert "bar " after the "foo" how can I achieve that?
我想到了 substring()
,但必须有一个更简单更简单的方法。
I thought of substring()
, but there must be a simpler more straight forward way.
推荐答案
您可以将自己的 splice()
原型化为String。
You could prototype your own splice()
into String.
if (!String.prototype.splice) {
/**
* {JSDoc}
*
* The splice() method changes the content of a string by removing a range of
* characters and/or adding new characters.
*
* @this {String}
* @param {number} start Index at which to start changing the string.
* @param {number} delCount An integer indicating the number of old chars to remove.
* @param {string} newSubStr The String that is spliced in.
* @return {string} A new string with the spliced substring.
*/
String.prototype.splice = function(start, delCount, newSubStr) {
return this.slice(0, start) + newSubStr + this.slice(start + Math.abs(delCount));
};
}
示例
Example
String.prototype.splice = function(idx, rem, str) {
return this.slice(0, idx) + str + this.slice(idx + Math.abs(rem));
};
var result = "foo baz".splice(4, 0, "bar ");
document.body.innerHTML = result; // "foo bar baz"
编辑:修改它以确保 rem
是绝对值。
Modified it to ensure that rem
is an absolute value.
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