java日期字符串排序_对字符串格式的日期进行排序

data() {return{

menu: [{

zt:&＃8217;已交&＃8217;,

obj:&＃8217;语文&＃8217;,

dt:&＃8217;2017-04-15&＃8242;,

},

{

zt:&＃8217;未交&＃8217;,

obj:&＃8217;数学&＃8217;,

dt:&＃8217;2022-12-14&＃8242;,

},

{

zt:&＃8217;已交&＃8217;,

obj:&＃8217;英语&＃8217;,

dt:&＃8217;2019-04-15&＃8242;,

}

],

}

},

methods: {

test() {var new_arr =[];var original_menu = this.menu;

console.log(original_menu);//去掉 &＃8211; 号, 转换为数字类型

original_menu.forEach(function(item) {

console.log(&＃8220;item.dt&＃8221;,item.dt);

let temp_item;

temp_item=item.dt;

temp_item= +(temp_item.split(&＃8216;-&＃8216;).join(&＃8221;));

console.log(&＃8220;temp_item:&＃8221;, temp_item);

new_arr.push({

zt: item.zt,

obj: item.obj,

dt: temp_item,

})

});

console.log(&＃8220;新数组new_arr:&＃8221;, new_arr);//选择排序

for (let i = 0; i new_arr[i].dt) {

let min_dt, min_zt, min_obj;

min_dt=new_arr[i].dt;

new_arr[i].dt=new_arr[j].dt;

new_arr[j].dt=min_dt;//顺便把dt 和 obj也排序

min_zt =new_arr[i].zt;

new_arr[i].zt=new_arr[j].zt;

new_arr[j].zt=min_zt;

min_obj=new_arr[i].obj;

new_arr[i].obj=new_arr[j].obj;

new_arr[j].obj=min_obj;

}

}

}

console.log(&＃8220;排序后new_arr:&＃8221;, new_arr);//增加 &＃8211; 号

let newarr2 =[];

new_arr.forEach(function(item) {

let item1=item.dt;

item1=item1.toString();

console.log(&＃8220;item:&＃8221;, item1);

let temp;

let temp1= item1.substring(0, 4);

let temp2= item1.substring(4, 6);

let temp3= item1.substring(6, 8);

temp= temp1.concat(&＃8216;-&＃8216;,temp2 , &＃8216;-&＃8216;, temp3 );

console.log(&＃8220;temp:&＃8221;, temp);

newarr2.push({

zt: item.zt,

obj: item.obj,

dt: temp

})

});

console.log(&＃8220;2号新数组newarr2:&＃8221;, newarr2);//重新渲染

for (var i = 0; i

}

}

}

}