外部代码更好地发回有效的 JSON。您的示例中的值不是有效的 JSON,因为密钥必须用双引号括起来。
我想出了一个小的纯 JavaScript 解析器,它可以通过自己添加双引号来处理简单的无效 JSON。它目前不支持非字符串值。
function ParseRawJSON(rawCode) {
var arrCandidates = [];
var lastOpenBracketIndex = -1;
for (var i = 0; i < rawCode.length; i++) {
var curChar = rawCode.charAt(i);
if (curChar === "}") {
if (lastOpenBracketIndex >= 0) {
arrCandidates.push(rawCode.substr(lastOpenBracketIndex, i - lastOpenBracketIndex + 1));
lastOpenBracketIndex = -1;
}
} else if (curChar === "{") {
lastOpenBracketIndex = i;
}
}
var arrJsonObjects = [];
for (var i = 0; i < arrCandidates.length; i++) {
var currentJSON = null;
try {
currentJSON = JSON.parse(arrCandidates[i]);
} catch (e) {
//try fixing
var fixedCandidate = TryFixJSON(arrCandidates[i]);
if (fixedCandidate) {
try {
currentJSON = JSON.parse(fixedCandidate);
} catch (e) {
currentJSON = null;
}
}
}
if (currentJSON != null) {
var keys = [];
for (var key in currentJSON)
keys.push(key);
if (keys.length > 0)
arrJsonObjects.push(currentJSON);
}
}
return arrJsonObjects;
function Trim(s, c) {
if (c instanceof Array) {
for (var i = 0; i < c.length; i++)
s = Trim(s, c[i]);
return s;
}
if (typeof c === "undefined")
c = " ";
while (s.length > 0 && s.charAt(0) === c)
s = s.substr(1, s.length - 1);
while (s.length > 0 && s.charAt(s.length - 1) === c)
s = s.substr(0, s.length - 1);
return s;
}
function TryFixJSON(strBlock) {
if (strBlock.indexOf(":") <= 0)
return false;
strBlock = strBlock.replace("{", "").replace("}", "");
var mainParts = strBlock.split(",");
for (var i = 0; i < mainParts.length; i++) {
var currentPart = Trim(mainParts[i]);
if (currentPart.indexOf(":") <= 0)
return false;
var subParts = currentPart.split(":");
if (subParts.length !== 2)
return false;
var currentKey = Trim(subParts[0], [" ", "'", "\""]);
var currentValue = Trim(subParts[1], [" ", "'", "\""]);
if (currentKey.length === 0)
return false;
subParts[0] = "\"" + currentKey + "\"";
subParts[1] = "\"" + currentValue + "\"";
mainParts[i] = subParts.join(":");
}
return "{" + mainParts.join(", ") + "}";
}
}
这将只查找和之间的任何内容{
并}
尝试解析为 JSON。没有评估,如果失败,它只会忽略无效块。成功?太好了,它将返回它找到的有效 JSON 的普通数组。
使用示例:
var rawCode = "var foo = new Object(); { dummy here }}} function boo() {}" +
"foo['KEY'] = { \"Field1\": \"Value1\", \"Field2\": \"Value2\"}; hello {\"foo\": \"bar\"} and it's over ";
var jsonObjects = ParseRawJSON(rawCode);
for (var i = 0; i < jsonObjects.length; i++) {
for (var key in jsonObjects[i]) {
var value = jsonObjects[i][key];
//got key and value...
}
}
现场测试用例,使用固定版本的示例代码。