Javascript 从字符串列表中删除前缀

Remove prefix from a list of strings

提问by Alex

How can I remove a sub-string (a prefix) from a array of string elements? (remove the sub string from each element)

如何从字符串元素数组中删除子字符串（前缀）？（从每个元素中删除子字符串）

回答by Joe

Using RegExpand ^to ensure it is the prefix and not just somewhere in the string:

使用RegExpand^确保它是前缀，而不仅仅是字符串中的某个地方：

var arr = ['a1', 'a2', 'a54a'];
for(var i = 0, len = arr.length; i < len; i++) {
    arr[i] = arr[i].replace(/^a/, '');
}
arr; // '1,2,54a' removing the 'a' at the begining

回答by AJcodez

function trimPrefix(str, prefix) {
    if (str.startsWith(prefix)) {
        return str.slice(prefix.length)
    } else {
        return str
    }
}

var prefix = "DynamicPrefix"
trimPrefix("DynamicPrefix other content", prefix)

回答by Wayne

Many of the answers already given are wrong, because they'll remove the target string from anywhere in each of the elements (not just the beginning). Here's another approach:

已经给出的许多答案都是错误的，因为它们会从每个元素的任何位置（不仅仅是开头）删除目标字符串。这是另一种方法：

var str = "str_";
["str_one", "str_two_str_", "str_three"].map(function(el) {
    return el.replace(new RegExp("^" + str), '');
});

Result:

结果：

["one", "two_str_", "three"]

Or, if you prefer simple iteration (with no higher-order function):

或者，如果您更喜欢简单迭代（没有高阶函数）：

var str = "str_";
var list = ["str_one", "str_two_str_", "str_three"];
for (var i = 0; i < list.length; i++)
    list[i] = list[i].replace(new RegExp("^" + str), '');

回答by Wayne

var pre = 'prefix_';

my_arr = my_arr.map(function(v){ return v.slice(pre.length); });

See MDNif full browser support for .map()is needed.

如果需要完整的浏览器支持，请参阅 MDN.map()。

you can also use .forEach()if you need to keep the original array.

.forEach()如果需要保留原始数组，也可以使用。

var pre = 'prefix_';

my_arr.forEach(function(v,i){ my_arr[i] = v.slice(pre.length); });

回答by Paul

var i;
for(i = 0; i < arr.length; i++)
    arr[i] = arr[i].replace(substr, '');

Example:

例子：

var arr = ['test1', '2test', '3test3'];

// Use only one of these lines
var substr = 'test';  // This is for substrings
var substr = /^test/; // This is for prefixes only

var i;
for(i = 0; i < arr.length; i++)
    arr[i] = arr[i].replace(substr, '');

console.log(arr); // Prints ["1", "2", "33"] to console

回答by Jake Feasel

Just for some variety:

只是为了一些品种：

substr = new RegExp('(^|\|)prefix_', 'g');
arr = arr.join('|').replace(substr, '').split('|')

edit- to show how you can limit to just the prefix with the right regexp.

编辑- 显示如何使用正确的正则表达式限制为前缀。

回答by ipr101

You could use the jQuery mapfunction -

你可以使用 jQuerymap函数 -

var arr = $.map(['a1', 'a2'],function (s) {
    return s.replace(/^a/,'');
});

回答by bozdoz

I would do this:

我会做这个：

var element = document.getElementsByTagName('p');
for(i in element){
 str = element[i].innerHTML;
 str = str.replace(/^pre_/,'');
 element[i].innerHTML = str;
}

回答by talnicolas

Just iterate on your list of string (with a for loop for example) and use the replacemethod (details here)

只需迭代您的字符串列表（例如使用 for 循环）并使用该replace方法（详情请点击此处）

回答by Alex Turpin

Simply loop through them?

简单地遍历它们？

var list = ["foo", "bar", "meh"];
for(var i = 0; i < list.length; i++)
    list[i] = list[i].substr(1, 1);

http://jsfiddle.net/DcvE2/1/

http://jsfiddle.net/DcvE2/1/