为什么变量要加双引号,而且前后还要加+号?

<html>

<head>

function Person(name,age,gender){

this.name = name;

this.age = age;

this.gender = gender;

}

var per = new Person("孙悟空",16,"男");

per.toString = function(){

return "Person[name="+this.name+",age= "+this.age+",gender="+this.gender+"]"

return "Person[name=孙悟空,age= 18,gender=男]"

}

console.log("per="+per);

</script>

</head>

<body>

</body>

</html>

问题一:为什么上面的变量this.name要加双引号,而且前后还加了两个+号?

问题二:为什么孙悟空这几个汉字作为字符串来说不能加引号?

慕码人0004322

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