JS対象クローン方法のまとめ
3754 ワード
1.基本的な対象のclone
// clone ,
var s = 'hello world';
var ss = s;
console.log(ss);
ss = "I'm changed";
console.log(s);
console.log(ss);
2.配列のclonevar a = [0,1,2,3];
var b = a.slice(0);
a = [3,2,1,0];
console.log(a);
console.log(b);
3.対象のclonelet obj = {'a': 'a', 'b': 'b', 'c': 'c'};
let copy = Object.assign({}, obj);
console.log(copy);
4.すべての対象のclonefunction clone(obj) {
var o;
if (typeof obj == "object") {
if (obj === null) {
o = null;
} else {
if (obj instanceof Array) {
o = [];
for (var i = 0, len = obj.length; i < len; i++) {
o.push(clone(obj[i]));
}
} else {
o = {};
for (var j in obj) {
o[j] = clone(obj[j]);
}
}
}
} else {
o = obj;
}
return o;
}
// test
var obj = {a: 'a', b: 'b', c: 'c'};
var copy = clone(obj);
参考文献:http://kingwell-leng.iteye.com/blog/1675694