如何獲得編碼的字符串原始長度包含\\字符在JavaScript中，jQuery的？

Question

我有一些JavaScript問題。我從數據庫中獲取編碼的字符串並放入它的javascript數組。字符串包含\\並且當我警告字符串長度比它有更大。我如何獲得原始字符串？ 這是我的字符串

var a = "eir~FdezuOha@ha_@rPzjQbnChxI~_Gf}\\|aAfnu@exNjmm@ilDvi]~Ttnz@tmLlyg@vi@nj`@`vIlrZznB`d^dd@zsVbvFdia@~bK~yT~uQxsPpmA|wL_bD|cCwiEfaEil@d`s@keEzri@u`Erw~Am|Dp{x@qJjbfBx}AdyrDkPtme@tgClei@feAziLrwFhJl}Ax`LvwHz||@nmHtrp@hGnnc@_D~j}@a@hskA_GjfuAlj]t_`@`sTheWjs@h{\\|AbxOj}LnxK`fN|gXtyH~cBrvElnKhaPxk`@jxB~v\\tqK~lLuUvkh@kBz~|As@tyfCfCbck@dbJhfh@h_QprrAcaC|czAunHbsr@qkMpm`@osk@|opB}nPvjvAthDp_kBhQdvt@zyK`pdAjlIx|OdiJln_@ngKzzu@l`YtdeAlqQrjZfzc@|y\\v{`@zks@h_@xcWf_CjoaArzNrbkAbfNb~c@nsVzeYjlTno]|hJxzU|~AflJvyDncJpnJdkKabBn`ToeE|pYcr@thRqpAh{NraHvkKnfCv}Js`@pmRx}EroV`dItwQnpQlcM~jAzrGikJdaHujMjxJs`@bxQzsEjlKmyCnrJc|FzrXu`FzhJ`eE`|LvfD`}`@rrDrr_@diHbdQbaBzrRajAd`[rzL~rwAtfDbhTn|HvvKluRvqWjiNxjHnlE|@ppKpfJbtDroDth@vre@oFnxRigF|nO{bEbwRwpGhmLld@rrKxuCbbRbnKbhSnve@vrr@}sBxqs@f{AnwZvZh{a@qnGdnSa~AlrKfmLjhe@q|AfmOj|FvlYzvE|br@j{Axr_@hkFfre@jhIdrg@udJbuRknHpbBgzBpdFc~AhyJorBzaOu|AffTpzFnaLv_W`{d@lhPrfJvxEfnJ~`KvuJ`nE~bTgzGztVwf@vsHngJ`eI~vV`yFv`m@sgAhhGwcC~iHtiH`ed@ruUbtO`tYv~Vlf^hdHlq@bnFvqLxin@p|Rxp[rkWnyTzka@jtVfqLvtF|aa@vcF`|Erc@~cIp}MjyUzuC|{O`lGp~Qhn@|rc@~mS|eg@vtZzi_@hqL|uSpkOrqHldHhkHl|Kjk[bgLdxItqa@jtDjiPbbDhwQryQlou@beVh|LnrJw}@~yRdk`@hhsAf~RtwSnbRblZp|CtgZfs]radA~~Bf_[zvArjTrcFfjNtzb@xgWziUtsN|af@tp\\blEluFpuFmsDn|FaoCdwCqlB~hFb|D|nMthQl_FfvFsxA|tYl|AnwP_Fzca@zbApjr@x]xP" 


alert(a.length) //length is 1279 

$.ajax({ 
    cache : false, 
    url : 'get_polylines.action', 
    type : 'post', 
    dataType : 'json', 
    async : false, 
    success : function(result) { 
     var polyline = result.polyline; 

     var arr = new Array(); 
     var k = 0; 
     for (var j = 0; j < polyline.length; j++) { 
      arr [k] = polyline[j]; 
      k++; 
     } 
     for(var i=0; i<arr.length; i++){ 
     alert(arr[i].length); //length is 1284 
     } 
    }, 

}); 

，當我把這個字符串輸入hiiden申請，然後獲得價值也提醒長度1284

Answer 1

使用String.split()削減了你的陣列，而不是通過字符串循環：

var a = "eir~FdezuOha@ha_@rPzjQbnChxI~_Gf}\\|aAfnu@exNjmm@ilDvi]~Ttnz@tmLlyg@vi@nj`@`vIlrZznB`d^dd@zsVbvFdia@~bK~yT~uQxsPpmA|wL_bD|cCwiEfaEil@d`s@keEzri@u`Erw~Am|Dp{x@qJjbfBx}AdyrDkPtme@tgClei@feAziLrwFhJl}Ax`LvwHz||@nmHtrp@hGnnc@_D~j}@a@hskA_GjfuAlj]t_`@`sTheWjs@h{\\|AbxOj}LnxK`fN|gXtyH~cBrvElnKhaPxk`@jxB~v\\tqK~lLuUvkh@kBz~|As@tyfCfCbck@dbJhfh@h_QprrAcaC|czAunHbsr@qkMpm`@osk@|opB}nPvjvAthDp_kBhQdvt@zyK`pdAjlIx|OdiJln_@ngKzzu@l`YtdeAlqQrjZfzc@|y\\v{`@zks@h_@xcWf_CjoaArzNrbkAbfNb~c@nsVzeYjlTno]|hJxzU|~AflJvyDncJpnJdkKabBn`ToeE|pYcr@thRqpAh{NraHvkKnfCv}Js`@pmRx}EroV`dItwQnpQlcM~jAzrGikJdaHujMjxJs`@bxQzsEjlKmyCnrJc|FzrXu`FzhJ`eE`|LvfD`}`@rrDrr_@diHbdQbaBzrRajAd`[rzL~rwAtfDbhTn|HvvKluRvqWjiNxjHnlE|@ppKpfJbtDroDth@vre@oFnxRigF|nO{bEbwRwpGhmLld@rrKxuCbbRbnKbhSnve@vrr@}sBxqs@f{AnwZvZh{a@qnGdnSa~AlrKfmLjhe@q|AfmOj|FvlYzvE|br@j{Axr_@hkFfre@jhIdrg@udJbuRknHpbBgzBpdFc~AhyJorBzaOu|AffTpzFnaLv_W`{d@lhPrfJvxEfnJ~`KvuJ`nE~bTgzGztVwf@vsHngJ`eI~vV`yFv`m@sgAhhGwcC~iHtiH`ed@ruUbtO`tYv~Vlf^hdHlq@bnFvqLxin@p|Rxp[rkWnyTzka@jtVfqLvtF|aa@vcF`|Erc@~cIp}MjyUzuC|{O`lGp~Qhn@|rc@~mS|eg@vtZzi_@hqL|uSpkOrqHldHhkHl|Kjk[bgLdxItqa@jtDjiPbbDhwQryQlou@beVh|LnrJw}@~yRdk`@hhsAf~RtwSnbRblZp|CtgZfs]radA~~Bf_[zvArjTrcFfjNtzb@xgWziUtsN|af@tp\\blEluFpuFmsDn|FaoCdwCqlB~hFb|D|nMthQl_FfvFsxA|tYl|AnwP_Fzca@zbApjr@x]xP" 
arr = a.replace(/\\/g,"\\\\").split(""); 
console.log(arr.length); //1284 

所以用這個替換您的Ajax調用的 「成功」 位：

success : function(result) { 
    var polyline = result.polyline; 

    var arr = polyline.replace(/\\/g,"\\\\").split(""); 
    var k = arr.length; //1284 
} 

輸出不同長度的原因是因爲您的字符串中有反斜槓（"\"）個字符。這些通常用於轉義特殊字符，並且在從字符串構建數組之前需要轉義。
替換是用.replace(/\\/g,"\\\\")完成的，用雙打替換所有單個反斜槓（"\"）（"\\"）。這導致數組返回1284的長度，這實際上是正確的：

console.log(arr); 
==> [<...> "G", "f", "}", "\", "\", "|", "a", "A", <...>] 
//Representing: 
"Gf}\\|aA";