?? getter ? setter? ???? ?? JavaScript? ??? ??? ??? ??? ? ?????
Nov 02, 2024 pm 10:10 PM
JavaScript?? ?? Getters/Setter ??
JavaScript?? ?? ??? ??? ?? getter ? setter? ???? ??? ???? ?? ???? ?????. ??? ????? ???? ?? ?? ??? ?? ??? ????? ? ??? ???? ?? ??? ??? ?????.
PHP? ?? Getter ? Setter ??
PHP? ?? ??? ?? getter ? setter ??? ???? ???? __get() ? __set() ?? ???. ?? ?? ??? ??? ? ?? ???? ??? ?? ??? ?????.
??? ?? JavaScript? ???
ES2015?? JavaScript? ?? getter ? setter ??. ???? ???? ?? ??? ?? ??? ??? ?? ??? ???? ?? ???? ???? ??? ? ????.
?? Getters/Setters? ???? ???? ?
???? ?? ?? ?? ?? "??"? ???? ??? ?? ?? ?? ? ???? ???? ?? ?? ??? ?????.
<code class="javascript">"use strict";
if (typeof Proxy == "undefined") {
throw new Error("This browser doesn't support Proxy");
}
let original = {
example: "value",
};
let proxy = new Proxy(original, {
get(target, name, receiver) {
if (Reflect.has(target, name)) {
let rv = Reflect.get(target, name, receiver);
if (typeof rv === "string") {
rv = rv.toUpperCase();
}
return rv;
}
return "missing";
}
});</code>
?? ?? ???
console.log(original.example = ${original.example}); // "original.example = value"
console.log(proxy.example = ${proxy.example}); // "proxy.example = VALUE"
console.log(proxy.unknown = ${proxy.unknown}); // "proxy.unknown = ??"
original.example = "updated";
console.log(original.example = ${original.example}); // "original.example = ?????"
console.log(proxy.example = ${proxy.example}); // "proxy.example = UPDATED"
??? ??? ???? ?? ???? ???? ???? ?? ??("??") ? ??? ??(??? ??)? ?? ??? ??? ?????. ?? ?? ??? ???? ???? ???? ?? ??? ??? ? ????.
???? ???
???? Chrome, Firefox? ??? ?? ?? ?? ?????? ?????. , Edge, Safari ? Internet Explorer 11.
? ??? ?? getter ? setter? ???? ?? JavaScript? ??? ??? ??? ??? ? ?????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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