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Message
SyntaxError: JSON.parse: unterminated string literal SyntaxError: JSON.parse: bad control character in string literal SyntaxError: JSON.parse: bad character in string literal SyntaxError: JSON.parse: bad Unicode escape SyntaxError: JSON.parse: bad escape character SyntaxError: JSON.parse: unterminated string SyntaxError: JSON.parse: no number after minus sign SyntaxError: JSON.parse: unexpected non-digit SyntaxError: JSON.parse: missing digits after decimal point SyntaxError: JSON.parse: unterminated fractional number SyntaxError: JSON.parse: missing digits after exponent indicator SyntaxError: JSON.parse: missing digits after exponent sign SyntaxError: JSON.parse: exponent part is missing a number SyntaxError: JSON.parse: unexpected end of data SyntaxError: JSON.parse: unexpected keyword SyntaxError: JSON.parse: unexpected character SyntaxError: JSON.parse: end of data while reading object contents SyntaxError: JSON.parse: expected property name or '}' SyntaxError: JSON.parse: end of data when ',' or ']' was expected SyntaxError: JSON.parse: expected ',' or ']' after array element SyntaxError: JSON.parse: end of data when property name was expected SyntaxError: JSON.parse: expected double-quoted property name SyntaxError: JSON.parse: end of data after property name when ':' was expected SyntaxError: JSON.parse: expected ':' after property name in object SyntaxError: JSON.parse: end of data after property value in object SyntaxError: JSON.parse: expected ',' or '}' after property value in object SyntaxError: JSON.parse: expected ',' or '}' after property-value pair in object literal SyntaxError: JSON.parse: property names must be double-quoted strings SyntaxError: JSON.parse: expected property name or '}' SyntaxError: JSON.parse: unexpected character SyntaxError: JSON.parse: unexpected non-whitespace character after JSON data
Error type
What went wrong?
JSON.parse() 会把一个字符串编译成JSON对象。如果字符串书写正确，那么这个字符串将会解析成一个有效的JSON，但是这个字符串被检测出错误语法的时候将会抛出错误。
Examples
JSON.parse() 不允许在末尾添加多余的“，”
下面两行代码都会抛出错误:
JSON.parse('[1, 2, 3, 4, ]');
JSON.parse('{"foo" : 1, }');
// SyntaxError JSON.parse: unexpected character
// at line 1 column 14 of the JSON data
省略末尾多余的逗号去解析JSON就会显示是正确:
JSON.parse('[1, 2, 3, 4 ]');
JSON.parse('{"foo" : 1 }');
JSON的属性名必须使用双引号
属性名上不能使用单引号, 例如： 'foo'.
JSON.parse("{'foo' : 1 }");
// SyntaxError: JSON.parse: expected property name or '}'
// at line 1 column 2 of the JSON data
取而代之，写成 "foo":
JSON.parse('{"foo" : 1 }');
0开头和小数点
数字的使用不能用0开头，比如01，并且你的小数点后面必须跟着至少一个数字。
JSON.parse('{"foo" : 01 }');
// SyntaxError: JSON.parse: expected ',' or '}' after property value
// in object at line 1 column 2 of the JSON data
JSON.parse('{"foo" : 1. }');
// SyntaxError: JSON.parse: unterminated fractional number
// at line 1 column 2 of the JSON data
正确的写法应该是只写一个1，不书写前面的0。在小数点的后面至少要跟上一个数字:
JSON.parse('{"foo" : 1 }');
JSON.parse('{"foo" : 1.0 }');