[英]How to assign multiple values to a JavaScript object?
假設我有一個帶有鍵/值對的對象,如下所示:
var someVar = {
color: "white",
font_size: "30px",
font_weight: "normal"
...some more variables and functions
};
有沒有辦法對這些鍵進行多重分配,而不必執行以下操作:
someVar.color = "blue";
someVar.font_size = "30px";
...
在 ES2015 中,您可以使用Object.assign
:
const someVar = {
color: "white",
font_size: "30px",
font_weight: "normal"
};
const newVar = Object.assign({}, someVar, {
color: "blue",
font_size: "30px"});
console.log(newVar);
=>
{
color: "blue",
font_size: "30px",
font_weight: "normal"
}
使用 ES6 擴展運算符:
someVar = {...someVar, color: "blue", font_size: "30px"}
您可以遍歷另一個對象:
var thingsToAdd = {
color: "blue",
font_size: "30px"
};
for (var x in thingsToAdd) someVar[x] = thingsToAdd[x];
或者,您可以使用with
(警告:這幾乎肯定是個壞主意!請參閱鏈接。我僅出於教育目的發布此內容;您幾乎不應該在生產代碼中使用with
!):
with (someVar) {
color = "blue";
font_size = "30px";
}
我會使用對象構造函數。 看起來像這樣:
function someVar (color,fontSize, fontWeight){
this.color = color,
this.fontSize = fontSize,
this.fontWeight = fontWeight
};
var var1 = new someVar("red","12px","45px");
var myvar ={};
myvar['color']='red';
myvar['width'] ='100px';
alert(myvar.color);
或alert(myvar['color']);
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.