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[英]How to store JSON with array in a localStorage (Javascript)?
[英]How to store alphabets in localstorage instead of clickcount in Javascript?
我正在創建一些動態控件,並且希望從本地存儲為其分配ID。 它的工作正常,但我想代替新的數字,我希望將字母(例如A,B)分配給新創建的控件。 有可能通過javascript實現嗎?
function nextNumber() {
if (typeof (Storage) !== "undefined") {
if (localStorage.clickcount) {
localStorage.clickcount = Number(localStorage.clickcount) + 1;
} else {
localStorage.clickcount = 1;
}
Increment = localStorage.clickcount;
} else {
}
}
elem.setAttributeNS(null, "id", "ID " + Increment)//assigning id
這是一個未經驗證的示例,您怎么做:
function nextNumber() {
if (typeof (Storage) !== "undefined") {
if (localStorage.clickcount) {
var indx = localStorage.clickcount.charCodeAt(0) - 65; // Get ascii value from char
localStorage.clickcount = String.fromCharCode(indx + 1);
} else {
localStorage.clickcount = "A"; // "A" has ascii value 65
}
Increment = localStorage.clickcount;
} else {
}
}
elem.setAttributeNS(null, "id", "ID " + Increment) //assigning id
基本上,您應該使用65以上的數字(這些數字表示從A開始的字符的ASCII值)。 考慮到這一點,當存儲初始計數器時,它應指向“ A”,所以它是65。當遞增時,應將該字符轉換回ASCII值,將其遞增1並轉換回字符。
您可以使用字母執行某些操作,並使用如下所示的charAt函數:
let alphab="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
function nextNumber() {
if (typeof (Storage) !== "undefined") {
if (localStorage.clickcount) {
localStorage.clickcount = Number(localStorage.clickcount) + 1;
} else {
localStorage.clickcount = 1;
}
Increment = localStorage.clickcount;
} else {
}
}
elem.setAttributeNS(null, "id", "ID " + alphab.charAt(Increment))//assigning id
但這僅限於alphab長度。 您需要為此類控件創建一個新功能。
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