格式化JSON的方法

var jsl = typeof jsl === 'undefined' ? {}: jsl;
jsl.format = (function() {
function repeat(s, count) {
return new Array(count + 1).join(s)
}
function formatJson(json) {
var i = 0,
il = 0,
tab = "    ",
newJson = "",
indentLevel = 0,
inString = false,
currentChar = null;
for (i = 0, il = json.length; i < il; i += 1) {
currentChar = json.charAt(i);
switch (currentChar) {
case '{':
case '[':
if (!inString) {
newJson += currentChar + "\n" + repeat(tab, indentLevel + 1);
indentLevel += 1
} else {
newJson += currentChar
}
break;
case '}':
case ']':
if (!inString) {
indentLevel -= 1;
newJson += "\n" + repeat(tab, indentLevel) + currentChar
} else {
newJson += currentChar
}
break;
case ',':
if (!inString) {
newJson += ",\n" + repeat(tab, indentLevel)
} else {
newJson += currentChar
}
break;
case ':':
if (!inString) {
newJson += ": "
} else {
newJson += currentChar
}
break;
case ' ':
case "\n":
case "\t":
if (inString) {
newJson += currentChar
}
break;
case '"':
if (i > 0 && json.charAt(i - 1) !== '\\') {
inString = !inString
}
newJson += currentChar;
break;
default:
newJson += currentChar;
break
}
}
return newJson
}
return {
"formatJson": formatJson
}
} ());

jsonVal = jsl.format.formatJson($('#json_input').val());