在Javascript中用单引号和双引号转义和取消转义字符串

在Javascript中用单引号和双引号转义和取消转义字符串,javascript,php,jquery,escaping,html-escape-characters,Javascript,Php,Jquery,Escaping,Html Escape Characters,我有一个搜索框,用户可以搜索任何字符串,包括单引号和双引号,一旦搜索完毕,后端会将关键字传递给我,以便我可以将其放回搜索框中。我不知道字符串是什么,所以我自己无法转义引号,下面是一个示例: var keyword = "hello"; $("#selectionkeywords").val(); 我遇到的问题是,如果用户输入“hello”,关键字将变为“hello”,我会收到以下错误: missing ) after argument list [Break On This Error]

我有一个搜索框,用户可以搜索任何字符串,包括单引号和双引号,一旦搜索完毕,后端会将关键字传递给我,以便我可以将其放回搜索框中。我不知道字符串是什么,所以我自己无法转义引号,下面是一个示例:

var keyword = "hello";
$("#selectionkeywords").val();
我遇到的问题是,如果用户输入“hello”,关键字将变为“hello”,我会收到以下错误:

missing ) after argument list
[Break On This Error]   
jQuery("#selectionkeywords").val(""hello"");
用户还可以输入单引号,这样也可以排除它。我尝试使用escape unescape,但仍然存在相同的问题,例如escape(“hello”) 我可以以一种未被替换的格式获取值,例如“hello”,但我不知道如何处理它,escape不起作用我最终得到的是这个%26%23034%3B hello%26%23034%3B


因此,我现在几乎陷入了困境,因为我无法对字符串做任何事情,有什么想法吗?

您必须转义字符串服务器端,因此javascript接收到的字符串已经转义,在PHP的情况下,您可以做:

$var = str_replace('"', '\"', $var);
然后在javascript中,请确保在双引号之间读取它,因为您为此进行了转义:

//use double quotes, as you escaped for them
jQuery("#selectionkeywords").val("<?php echo $var ?>"); 
//使用双引号,正如您为它们转义的那样
jQuery(“#selectionkeywords”).val(“”);

您必须转义字符串服务器端,因此javascript接收已转义的字符串,对于PHP,您可以执行以下操作:

$var = str_replace('"', '\"', $var);
然后在javascript中,请确保在双引号之间读取它,因为您为此进行了转义:

//use double quotes, as you escaped for them
jQuery("#selectionkeywords").val("<?php echo $var ?>"); 
//使用双引号,正如您为它们转义的那样
jQuery(“#selectionkeywords”).val(“”);

当您从服务器到客户端和viceversa交换数据时,您希望使用base64编码和解码,以避免这类问题和其他类型的问题

Java端:

import javax.xml.bind.DatatypeConverter;

/* ... */

/* Decode input from client */
String input = DatatypeConverter.printBase64Binary(inputFromClient);

/* Encode output for client */
String output = DatatypeConverter.printBase64Binary(encodedOutput);
// Encode data for the server
var dataForServer = Base64.encode(data);

// Decode data coming from the server
var data = Base64.decode(dataFromServer);
Javascript端:

import javax.xml.bind.DatatypeConverter;

/* ... */

/* Decode input from client */
String input = DatatypeConverter.printBase64Binary(inputFromClient);

/* Encode output for client */
String output = DatatypeConverter.printBase64Binary(encodedOutput);
// Encode data for the server
var dataForServer = Base64.encode(data);

// Decode data coming from the server
var data = Base64.decode(dataFromServer);
使用这个类

var Base64 = {

    // private property
    _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

    // public method for encoding
    encode : function (input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;

        input = Base64._utf8_encode(input);

        while (i < input.length) {

            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);

            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;

            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }

            output = output +
            this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
            this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

        }

        return output;
    },

    // public method for decoding
    decode : function (input) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;

        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

        while (i < input.length) {

            enc1 = this._keyStr.indexOf(input.charAt(i++));
            enc2 = this._keyStr.indexOf(input.charAt(i++));
            enc3 = this._keyStr.indexOf(input.charAt(i++));
            enc4 = this._keyStr.indexOf(input.charAt(i++));

            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;

            output = output + String.fromCharCode(chr1);

            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }

        }

        output = Base64._utf8_decode(output);

        return output;

    },

    // private method for UTF-8 encoding
    _utf8_encode : function (string) {
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";

        for (var n = 0; n < string.length; n++) {

            var c = string.charCodeAt(n);

            if (c < 128) {
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }

        }

        return utftext;
    },

    // private method for UTF-8 decoding
    _utf8_decode : function (utftext) {
        var string = "";
        var i = 0;
        var c = c1 = c2 = 0;

        while ( i < utftext.length ) {

            c = utftext.charCodeAt(i);

            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            }
            else if((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i+1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            }
            else {
                c2 = utftext.charCodeAt(i+1);
                c3 = utftext.charCodeAt(i+2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }

        }

        return string;
    }

}
var Base64={
//私有财产
_keyStr:“ABCDEFGHIJKLMNOPQRSTUVXYZABCDFGHIJKLMNOPQRSTUVXYZ0123456789+/=”,
//公共编码方法
编码:功能(输入){
var输出=”;
变量chr1,chr2,chr3,enc1,enc2,enc3,enc4;
var i=0;
输入=Base64.\u utf8\u编码(输入);
while(i>2;
enc2=((chr1&3)>4);
enc3=((chr2&15)>6);
enc4=chr3&63;
if(isNaN(chr2)){
enc3=enc4=64;
}否则如果(isNaN(chr3)){
enc4=64;
}
输出=输出+
本钥匙字符(附件1)+本钥匙字符(附件2)+
此键字符(enc3)+此键字符(enc4);
}
返回输出;
},
//公开解码方法
解码:功能(输入){
var输出=”;
变种chr1,chr2,chr3;
变量enc1、enc2、enc3、enc4;
var i=0;
输入=输入。替换(/[^A-Za-z0-9\+\/\=]/g,”);
while(i4);
chr2=((enc2&15)>2);
chr3=((enc3&3)127)和&(c<2048)){
utftext+=String.fromCharCode((c>>6)| 192);
utftext+=String.fromCharCode((c&63)| 128);
}
否则{
utftext+=String.fromCharCode((c>>12)| 224);
utftext+=String.fromCharCode((c>>6)和63)| 128);
utftext+=String.fromCharCode((c&63)| 128);
}
}
返回utftext;
},
//UTF-8解码的专用方法
_utf8_解码:函数(utftext){
var字符串=”;
var i=0;
var c=c1=c2=0;
while(i191)和&(c<224)){
c2=utftext.charCodeAt(i+1);

string+=string.fromCharCode(((c&31)当您从服务器到客户端和其他服务器交换数据时,您希望使用base64编码和解码,以避免此问题和其他类型的问题

Java端:

import javax.xml.bind.DatatypeConverter;

/* ... */

/* Decode input from client */
String input = DatatypeConverter.printBase64Binary(inputFromClient);

/* Encode output for client */
String output = DatatypeConverter.printBase64Binary(encodedOutput);
// Encode data for the server
var dataForServer = Base64.encode(data);

// Decode data coming from the server
var data = Base64.decode(dataFromServer);
Javascript端:

import javax.xml.bind.DatatypeConverter;

/* ... */

/* Decode input from client */
String input = DatatypeConverter.printBase64Binary(inputFromClient);

/* Encode output for client */
String output = DatatypeConverter.printBase64Binary(encodedOutput);
// Encode data for the server
var dataForServer = Base64.encode(data);

// Decode data coming from the server
var data = Base64.decode(dataFromServer);
使用这个类

var Base64 = {

    // private property
    _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

    // public method for encoding
    encode : function (input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;

        input = Base64._utf8_encode(input);

        while (i < input.length) {

            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);

            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;

            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }

            output = output +
            this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
            this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

        }

        return output;
    },

    // public method for decoding
    decode : function (input) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;

        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

        while (i < input.length) {

            enc1 = this._keyStr.indexOf(input.charAt(i++));
            enc2 = this._keyStr.indexOf(input.charAt(i++));
            enc3 = this._keyStr.indexOf(input.charAt(i++));
            enc4 = this._keyStr.indexOf(input.charAt(i++));

            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;

            output = output + String.fromCharCode(chr1);

            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }

        }

        output = Base64._utf8_decode(output);

        return output;

    },

    // private method for UTF-8 encoding
    _utf8_encode : function (string) {
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";

        for (var n = 0; n < string.length; n++) {

            var c = string.charCodeAt(n);

            if (c < 128) {
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }

        }

        return utftext;
    },

    // private method for UTF-8 decoding
    _utf8_decode : function (utftext) {
        var string = "";
        var i = 0;
        var c = c1 = c2 = 0;

        while ( i < utftext.length ) {

            c = utftext.charCodeAt(i);

            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            }
            else if((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i+1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            }
            else {
                c2 = utftext.charCodeAt(i+1);
                c3 = utftext.charCodeAt(i+2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }

        }

        return string;
    }

}
var Base64={
//私有财产
_keyStr:“ABCDEFGHIJKLMNOPQRSTUVXYZABCDFGHIJKLMNOPQRSTUVXYZ0123456789+/=”,
//公共编码方法
编码:功能(输入){
var输出=”;
变量chr1,chr2,chr3,enc1,enc2,enc3,enc4;
var i=0;
输入=Base64.\u utf8\u编码(输入);
while(i>2;
enc2=((chr1&3)>4);
enc3=((chr2&15)>6);
enc4=chr3&63;
if(isNaN(chr2)){
enc3=enc4=64;
}否则如果(isNaN(chr3)){
enc4=64;
}
输出=输出+
本钥匙字符(附件1)+本钥匙字符(附件2)+
此键字符(enc3)+此键字符(enc4);
}
返回输出;
},
//公开解码方法
解码:功能(输入){
var输出=”;
变种chr1,chr2,chr3;
变量enc1、enc2、enc3、enc4;
var i=0;
输入=输入。替换(/[^A-Za-z0-9\+\/\=]/g,”);
while(i