[英]how to add property in object in increasing order in javascript?
我有对象数组。在对象中,有些具有shortkeys
属性,有些没有shortkeys
属性。 我想为所有对象添加shortkeys
属性。 重要的是我需要为所有对象提供唯一的shortkeys
。
那些没有shortkeys
对象将遵循这些条件
shortkeys
,则它会分配从1-9开始的shortkeys
,例如 'alt+1' 、'alt+2'...'alt+9'。9
之后,我需要将0
属性分配给 object 。az
shortkeys
,例如“alt+m”。这样每个对象都具有唯一的属性。这是我的代码https://jsfiddle.net/krzz9zmf/
var arr=[
{name:"abc",shortkeys:"alt+m"},
{name:"c_1"},
{name:"abc",shortkeys:"alt+t"},
{name:"abc",shortkeys:"alt+c"},
{name:"wes_2"},
{name:"ncv_3"},
{name:"sghb_4"},
{name:"ijo_5"},
{name:"nhio_6"},
{name:"jion_7"},
{name:"chudoi_8"},
{name:"bdmki_9"},
{name:"dssd_0"},
{name:"sdfs_a"},
{name:"abc",shortkeys:"alt+y"},
{name:"abc",shortkeys:"alt+e"},
{name:"sghb_b"},
{name:"ijo_d"},
{name:"gsha_e"},
{name:"asdas_f"},
{name:"bbb_g"},
{name:"mko_h"},
{name:"kioh_i"},
{name:"qwee_j"},
{name:"qwee_k"},
{name:"qwee_l"},
{name:"qwee_n"},
]
var j =1;
for(var i=0;i<arr.length;i++){
var obj =arr[i];
if (!'shortkeys' in myObj){
//add shorkeys start from 1-9 then 0 and then a-z.In other words need to assign shortcut key like that 'alt+1','alt+2'....'alt+0'''alt+a','alt+b'...'alt+z';
//some of the objects already define shortkeys example 'alt+m' .so I need to skip these shortcut key .so that each item have unique shortcut.
myObj.shortkeys= 'alt+'+j;
j++;
if(j==10){
j=0
}
if(j==1){
myObj.shortkeys='alt+a';
}
}
}
预期产出
[
{name:"abc",shortkeys:"alt+m"},
{name:"c_1",,shortkeys:"alt+1"},
{name:"abc",shortkeys:"alt+t"},
{name:"abc",shortkeys:"alt+c"},
{name:"wes_2",shortkeys:"alt+2"},
{name:"ncv_3",,shortkeys:"alt+3"},
{name:"sghb_4",shortkeys:"alt+4"},
{name:"ijo_5",shortkeys:"alt+5"},
{name:"nhio_6",shortkeys:"alt+6"},
{name:"jion_7",shortkeys:"alt+7"},
{name:"chudoi_8",shortkeys:"alt+8"},
{name:"bdmki_9",shortkeys:"alt+9"},
{name:"dssd_0",shortkeys:"alt+0"},
{name:"sdfs_a",shortkeys:"alt+a"},
{name:"abc",shortkeys:"alt+y"},
{name:"abc",shortkeys:"alt+e"},
{name:"sghb_b",shortkeys:"alt+b"},
{name:"ijo_d",shortkeys:"alt+d"},
{name:"gsha_e",shortkeys:"alt+e"},
{name:"asdas_f",shortkeys:"alt+f"},
{name:"bbb_g",shortkeys:"alt+g"},
{name:"mko_h",shortkeys:"alt+h"},
{name:"kioh_i",shortkeys:"alt+i"},
{name:"qwee_j",shortkeys:"alt+j"},
{name:"qwee_k",shortkeys:"alt+k"},
{name:"qwee_l",shortkeys:"alt+l"},
{name:"qwee_n",shortkeys:"alt+n"},
]
您可以遍历并删除作为键存在的字符,然后返回并添加剩余的字符
https://jsfiddle.net/stevenkaspar/krzz9zmf/8/
var alpha_num_array = [
'1','2','3','4',
'5','6','7','8','9',
'0',
'a','b','c','d','e',
'f','g','h','i','j',
'k','l','m','n','o',
'p','q','r','s','t',
'u','v','w','x','y',
'z'];
key_arr.map(function(k){
if(!k.shortkeys) return;
var key = k.shortkeys.split('+')[1];
var key_index = alpha_num_array.indexOf(key);
alpha_num_array.splice(key_index, 1);
})
key_arr = key_arr.map(function(k){
if(k.shortkeys) return k;
k.shortkeys = 'alt+'+alpha_num_array[0];
alpha_num_array.shift();
return k;
})
console.log(key_arr);
var arr=[ {name:"abc",shortkeys:"alt+m"}, {name:"c_1"}, {name:"abc",shortkeys:"alt+t"}, {name:"abc",shortkeys:"alt+c"}, {name:"wes_2"}, {name:"ncv_3"}, {name:"sghb_4"}, {name:"ijo_5"}, {name:"nhio_6"}, {name:"jion_7"}, {name:"chudoi_8"}, {name:"bdmki_9"}, {name:"dssd_0"}, {name:"sdfs_a"}, {name:"abc",shortkeys:"alt+4"}, {name:"abc",shortkeys:"alt+e"}, {name:"sghb_b"}, {name:"ijo_d"}, {name:"gsha_e"}, {name:"asdas_f"}, {name:"bbb_g"}, {name:"mko_h"}, {name:"kioh_i"}, {name:"qwee_j"}, {name:"qwee_k"}, {name:"qwee_l"}, {name:"qwee_n"}, ]; //possible shortkeys reversed so we can pop them off var keys = [ '1','2','3','4','5','6','7','8','9','0' ,'a','b','c','d','e','f','g','h','i','j' ,'k','l','m','n','o','p','q','r','s','t' ,'u','v','w','x','y','z'].reverse(); //elements without a shortkeys var tagsWithoutShortcuts = arr.filter(function(element){ return typeof element.shortkeys === 'undefined'; }); console.log(keys); console.log(tagsWithoutShortcuts); tagsWithoutShortcuts.forEach(function(tag){ var key = keys.pop(); //while key is already used, get another while (arr.filter(function(element){ return element.shortkeys === 'alt+'+ key; }).length) key = keys.pop(); //put the shortkeys on the tag tag.shortkeys = 'alt+'+ key; }); console.log(arr);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
您现有尝试的错误(除了没有得到您想要的字母)是...
var obj
后使用了错误的变量名myObj
if (!'shortkeys' in myObj){
而不是if (!('shortkeys' in myObj)){
shortkeys
之前,你没有找到现有的shortkeys
在这段代码中,我...
az
字符的alpha
变量for
循环中添加了一个OUTER
标签,以便我们可以在超出字母z
中断循环。 标签是必需的,因为我们正在打破内部do-while
循环。 var arr=[ {name:"abc",shortkeys:"alt+m"}, {name:"c_1"}, {name:"abc",shortkeys:"alt+t"}, {name:"abc",shortkeys:"alt+c"}, {name:"wes_2"}, {name:"ncv_3"}, {name:"sghb_4"}, {name:"ijo_5"}, {name:"nhio_6"}, {name:"jion_7"}, {name:"chudoi_8"}, {name:"bdmki_9"}, {name:"dssd_0"}, {name:"sdfs_a"}, {name:"abc",shortkeys:"alt+y"}, {name:"abc",shortkeys:"alt+e"}, {name:"sghb_b"}, {name:"ijo_d"}, {name:"gsha_e"}, {name:"asdas_f"}, {name:"bbb_g"}, {name:"mko_h"}, {name:"kioh_i"}, {name:"qwee_j"}, {name:"qwee_k"}, {name:"qwee_l"}, {name:"qwee_n"} ] var j = 1; var alpha = 'a'.charCodeAt(0); // Number for the 'az' chars var z = 'z'.charCodeAt(0); // Number for the 'z' character var shorts = {}; // Holds all shortkeys to avoid duplicates var short = ""; // First gather all the existing shortkeys for (var i = 0; i < arr.length; i++) { if (arr[i].shortkeys) { shorts[arr[i].shortkeys] = arr[i].shortkeys } } OUTER: for (var i = 0; i < arr.length; i++) { var myObj = arr[i]; if (!('shortkeys' in myObj)) { // We want to make sure that our "short" is not yet used. do { if (j < 10) { short = 'alt+' + j j++; } else if (j == 10) { short = 'alt+0' j++; } else if (alpha <= z) { short = 'alt+' + String.fromCharCode(alpha); alpha++; } else { break OUTER; // We've moved beyond 'z', so just quit. } } while(short in shorts) // Track the new shortkey, and assign it shorts[short] = short myObj.shortkeys = short } } document.querySelector("pre").textContent = JSON.stringify(arr, null, 4)
<pre></pre>
笔记...
alt+e
。
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