[unexpected token o in JSON at position 1 causes and solutions]

 			var joinObj
            var message;
            var code;
            var typeStr = typeof(result)
            if (typeStr == 'object'){
                
                message = result.message;
                code = result.code;
            } else if(typeStr == 'string'){
    
                joinObj = JSON.parse(result)
                message = joinObj.message
                code = joinObj.code
            }  
            if(code === 0) {
                  
                return window.alert(message);
            }
            else if(code === 1){
                  
                window.location.href = '/login.html'
                return window.alert(message);
            }

among result Is the data returned by the server , Use typeof Resolves the return value type , If it is object Type is not used JSON.parse(result) Otherwise use JSON.parse Generate an object . So you can get the attribute method .