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code = { "a" : 1, "b" : { "c" : 3 }}
code.b = code.b || {};
var code = { "a" : 1, "b" : { "c" : 3 }}; if(!code.e){console.info(1)}else{console.info(2)}
code = { "a" : 1, "b" : { "c" : 3 }}
if(code.b)alert(code.b.c)
var code = { "a" : 1};
if(typeof code.b == "object")
alert(code.b.c);
else
alert("code.b不是一个对象");
var code = { "a" : 1, "b" : { "c" : 3 }}; code.b.c
实测无错误