为什么用Javascript字符串替换会颠倒从右到左语言的单词顺序? [英] Why does Javascript string replace reverse the word order for right to left languages?
问题描述
我很好奇为什么以下占位符替换为从右到左的语言(这些是随机的阿拉伯字符)会导致格式化后的字符串将所有单词颠倒.
I'm curious as to why the following placeholder replacement for a right to left language (these are random Arabic characters) causes the formatted string to reverse all the words.
'{0} تكنولوجيا'.replace('{0}', 'هلهل')
=> "هلهل تكنولوجيا"
在最新的Chrome,FF和Safari中观察到此行为.它使单词顺序在Node中保持不变.
This behavior was observed in the latest Chrome, FF, and Safari. It keeps the word order the same in Node.
推荐答案
不是. replace
完全按照您的要求执行:用هلهل
替换该字符串的前三个字母;我将其设置为四个而不是三个,以便原始和替换的长度相同(以便更轻松地查看正在发生的情况):
It doesn't. replace
does exactly what you asked it to do: Replaces the first three letters of that string with هلهل
; I'm going to make it four rather than three so the original and the replacement are the same length (makes it easier to see what's going on):
var before = '{00} تكنولوجيا';
var rep = 'هلهل';
var after = before.replace('{00}', rep);
console.log("before", before.split("").map(toCharCode).join(", "));
console.log("rep ", rep.split("").map(toCharCode).join(", "));
console.log("after ", after.split("").map(toCharCode).join(", "));
function toCharCode(c) {
var hex = c.charCodeAt(0).toString(16);
hex = "0000".substr(hex.length - 4) + hex;
return "U-" + hex;
}
输出:
before U-007b, U-0030, U-0030, U-007d, U-0020, U-062a, U-0643, U-0646, U-0648, U-0644, U-0648, U-062c, U-064a, U-0627
rep U-0647, U-0644, U-0647, U-0644
after U-0647, U-0644, U-0647, U-0644, U-0020, U-062a, U-0643, U-0646, U-0648, U-0644, U-0648, U-062c, U-064a, U-0627
请注意,替换序列(U-0647,U-0644,U-0647,U-0644)现在位于字符串的开头.
Note that the replacement sequence (U-0647, U-0644, U-0647, U-0644) is now at the beginning of the string.
您所看到的是字符串显示的方式.因为RTL字符的连续范围是从右到左显示的,所以您现在有一个RTL范围,它以这种方式显示:替换在开头(最右边),文本继续在左边.以前,您对LTR和RTL有误,这与LTR(从左至右显示)和RTL(从右至左显示)一起显示.
What you're seeing is the way the string is displayed. Because contiguous spans of RTL characters are displayed right-to-left, and you now have a single span of RTL which is shown in that way: The replacement is at the beginning (the far right) and the text continues to the left. Before, you had a mis of LTR and RTL, which was shown with the LTR (shown from left to right) followed by the RTL (shown from right to left).
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