7.19 怎么实现深拷贝
1.一层深拷贝
let saveformData = {};
for(let key in formData){
saveformData[key] = formData[key] == undefined ? "" : formData[key];
2.全部深拷贝
let saveformData = JSON.parse(JSON.stringify(formData))
1.一层深拷贝
let saveformData = {};
for(let key in formData){
saveformData[key] = formData[key] == undefined ? "" : formData[key];
2.全部深拷贝
let saveformData = JSON.parse(JSON.stringify(formData))