问题描述
我想做一个小程序,从数组中删除一些不需要的字符,如“/n”、“/t”,问题是它部分工作。我看到程序删除了一些我想要的字符,但不是所有索引(例如:第 3 个和第 5 个):
程序:
var contenuespacemenu = $('.Espace-Menu').children('div').html(); //the array which contains characters i want to delete.
var bannedcaractere = ["\n","\t"];
var caractereinside = [];
for (var i = 0; i < 50; i++) {
for (var j = 0; j < (bannedcaractere.length); j++) {
let test = contenuespacemenu[i] == bannedcaractere[j];
if (test) {
i = i + 1;
} else {
caractereinside[i] = contenuespacemenu[i];
}
}
}
console.log(caractereinside);
它显示了这个结果:
一些不需要的字符被删除,但不是全部... 索引 3 和 5。
这是将 html 标签的字符串内容逐个字符放入数组“caractereinside”的主要代码:
结果:
如果我将“var contenuespacemenu”转换成这样的常规数组,它会起作用:
我明白了:
我也试图用一个休息来代替 i = i+1 就像我的身高一样,就像这样:
var contenuespacemenu = $('.Espace-Menu').children('div').html();
var bannedcaractere = ["\n","\t"];
var caractereinside = [];
for (var i = 0; i < 50; i++) {
for (var j = 0; j < (bannedcaractere.length); j++) {
let test = contenuespacemenu[i] == bannedcaractere[j];
if (test) {
break;
}
else {
caractereinside[i] = contenuespacemenu[i];
}
}
}
console.log(caractereinside);
但它给了我这个:
最后,我再次尝试使用 i = i+1 并为 var contenuespacemenu 定义了数组,也更改了 var bannedcharacter,并且它的工作方式应该是:
var contenuespacemenu = ["1","8"];//the array which contains characters i want to delete.
var bannedcaractere = ["1","4"];
var caractereinside = [];
for (var i = 0; i < 50; i++) {
for (var j = 0; j < (bannedcaractere.length); j++) {
let test = contenuespacemenu[i] == bannedcaractere[j];
if (test) {
i = i+1;
} else {
caractereinside[i] = contenuespacemenu[i];
}
}
}
console.log(caractereinside);
结果:
解决方法
不确定您为什么使用 2 个循环,但我已通过更改以下内容将您的上一个示例更改为工作状态:
- 将硬编码的
50
更改为contenuespacemenu.length
- 在第二个循环/
test
之外,我将使用!bannedcaractere.includes(contenuespacemenu[i])
检查当前字符是否有效 - 删除了
i = i+1;
,因为我们应该让for
处理迭代器 - 使用
push()
而不是caractereinside[i]
来防止对删除的索引进行undefined
var contenuespacemenu = ["1","2","3","4","5","6","7","8","1","3"];
var bannedcaractere = ["1","4"];
var caractereinside = [];
// Remove all from bannedCars
for (var i = 0; i < contenuespacemenu.length; i++) {
if (!bannedcaractere.includes(contenuespacemenu[i])) {
caractereinside.push(contenuespacemenu[i]);
}
}
// Result
console.log(caractereinside);
也就是说,可以通过使用 filter
和 includes
来简化上述内容:
var contenuespacemenu = ["1","4"];
// Filter
let caractereinside = contenuespacemenu.filter(n => !bannedcaractere.includes(n));
// Result
console.log(caractereinside);
如果 contenuespacemenu
是一个数组,请尝试:
const contenuespacemenu = $('.Espace-Menu').children('div').html(); //the array which contains characters i want to delete.
const bannedcaractere = ["\n","\t"];
const caractereinside = contenuespacemenu.slice(0,contenuespacemenu.length); // I copy the table so as not to risk modifying it later
for (let i = 0; i < 50; i++) {
let test = bannedcaractere.includes(caractereinside[i]);
if (test) {
caractereinside.splice(i,1);
}
}
// 50 must be the length of the characterinside array if you want to iterate over the whole array
console.log(caractereinside);
Else If contenuespacemenu
一堆文本尝试使用:
const contenuespacemenu = $('.Espace-Menu').children('div').html(); //the array which contains characters i want to delete.
const bannedcaractere = ["\n","\t"];
const caractereinside = [];
for (const i = 0; i < 50; i++) {
caractereinside[i] = contenuespacemenu[i];
let test = bannedcaractere.includes(caractereinside[i]);
if (test) {
caractereinside.splice(i,1);
}
}
// 50 must be the length of the characterinside array if you want to iterate over the whole contenuespacemenu
console.log(caractereinside);