JS recursive tree structure calculates the number of leaf nodes of each node and outputs it

        var json = {
            "text" : " Table column name ",
            "children" : [{
                "text" : " Serial number ",
                "children" : [{
                    "text" : " Serial number one ",
                    "children" : []
                },{
                    "text" : " No. 2 ",
                    "children" : []
                }]
            },{
                "text" : " name ",
                "children" : []
            },{
                "text" : " project ",
                "children" : [{
                    "text" : " Item 1 ",
                    "children" : [{
                        "text" : " Item 2 ",
                        "children" : []
                    }]
                }]
            }]
        };

        //colspan Record the number of all leaf nodes of the node 
        function getLeafCountTree(json) {
            if(json.children.length == 0){
                json.colspan = 1;
                return 1;
            }else{
                var leafCount = 0;
                for(var i = 0 ; i < json.children.length ; i++){
                    leafCount = leafCount + getLeafCountTree(json.children[i]);
                }
                json.colspan = leafCount;
                return leafCount;
            }
        }
        getLeafCountTree(json);