微信小程序界面传值之JSON解析错误

小程序界面跳转参数传递过程中遇到 json 解析错误 的解决方案:
小程序界面跳转参数传递规则 导致了你的参数中不能含有?,=这种字符

wx.navigateTo({
  url: 'test?id=1'
})

如果你传递的参数中含有 ?,=就会解析失败
解决:

• 先将你的参数转成json 字符串;
• 然后将这个字符串转成base64 字符串;
• 再将这个base64 encode;

在下一个界面

• 将参数 decodeURIComponent
• 然后 base64 decode
• 然后 Json parse

上代码

当前界面->子界面

// 用户抓取记录
jumpToUserCatch(e){
    console.log(e.currentTarget.dataset.mode)
    let mode = e.currentTarget.dataset.mode
    // 转成json 字符串
    let modeStr = JSON.stringify(mode)
    // base64 encode
    let mode64 = base64.encode(modeStr)
    // url encode
    let modeEncode = encodeURIComponent(mode64)
    console.log(mode64)

    console.log(base64.decode(mode64))
    wx.navigateTo({
      url: '../CatchList/catch?mode=' + modeEncode,
    })
  },

/**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    console.log('---------')
    console.log(options)
    let modeEncode = options.mode
    let modeDecode = decodeURIComponent(modeEncode)
    console.log(modeDecode)
    let mode = JSON.parse(base64.decode(modeDecode))
    this.setData({
      mode: mode
    })
    this.loadData(mode)
  },

base64.js 文件

// private property  
var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

// public method for encoding  
const encode = function (input) {
  var output = "";
  var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
  var i = 0;
  input = _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 +
      _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
      _keyStr.charAt(enc3) + _keyStr.charAt(enc4);
  }
  return output;
}

// public method for decoding  
const 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 = _keyStr.indexOf(input.charAt(i++));
    enc2 = _keyStr.indexOf(input.charAt(i++));
    enc3 = _keyStr.indexOf(input.charAt(i++));
    enc4 = _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 = _utf8_decode(output);
  return output;
}

// private method for UTF-8 encoding  
const _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  
const _utf8_decode = function (utftext) {
  var string = "";
  var i = 0;
  var c = 0, c1 = 0, c2 = 0, c3;
  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;
}


module.exports = {
  encode: encode,
  decode: decode,
}