JavaScript日期变量分配 [英] Javascript date variable assignment

问题描述

var date1 = new Date();  
date1.setFullYear(2011, 6, 1);  

// 2011-07-01, ok  
console.log(date1);

// set date2 the same date as date1  
var date2 = date1;

// ...

// now I'm gonna set a new date for date2  
date2.setFullYear(2011, 9, 8);

// 2011-10-08, ok  
console.log(date2);

// 2011-10-08, wrong, expecting 2011-07-01  
// I didn't assign a new date to date1  
// WHY is date1 changed?  
console.log(date1);

推荐答案

Date是object，因此它被指定为引用-简单的方法是

Date is object , so it is assigned as reference - simple approach is

date2 = new Date( date1 );

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