Question

假设我想在Javascript函数内动态创建一个JSX标签树，然后将它们添加到我的React代码中。那可能吗？如果是这样，你会怎么做？

编辑：我收到<div className="msg"><p>Hello World</p></div>作为字符串，所以我不能在没有引号的情况下返回它。另外，不使用dangerouslySetInnerHTML。

JSX工厂

function jsxFactory() {
  return '<div className="msg"><p>Hello World</p></div>'
}

反应代码

render() {
  render(
    {jsxFactory()}
  )
}

Answer 1

你可以在没有引号的情况下完成。

return <div className="msg"><p>Hello World</p></div>

Answer 2

如果您明确需要在字符串中插入HTML，则需要dangerouslySetInnerHtml，大致如下：

so=> create table so81(i int);
CREATE TABLE
so=> create table so82(check (i > 2)) inherits (so81);
CREATE TABLE
so=> create table so83(check (i > 0 and i<=2)) inherits (so81);
CREATE TABLE

so=> insert into so82 select 3;
INSERT 0 1
so=> select * from only so81;
 i
---
(0 rows)

so=> select * from so81;
 i
---
 3
(1 row)

so=> SET constraint_exclusion = on;
SET
so=> prepare so83 (int) as select 1 from so81 where i = $1;
ERROR:  prepared statement "so83" already exists
so=> prepare so84 (int) as select 1 from so81 where i = $1;
PREPARE
so=> explain analyze execute so83(3);
                                                 QUERY PLAN
------------------------------------------------------------------------------------------------------------
 Result  (cost=0.00..42.02 rows=14 width=4) (actual time=0.037..0.039 rows=1 loops=1)
   ->  Append  (cost=0.00..41.88 rows=14 width=0) (actual time=0.037..0.039 rows=1 loops=1)
         ->  Seq Scan on so81  (cost=0.00..0.00 rows=1 width=0) (actual time=0.005..0.005 rows=0 loops=1)
               Filter: (i = 3)
         ->  Seq Scan on so82  (cost=0.00..41.88 rows=13 width=0) (actual time=0.030..0.031 rows=1 loops=1)
               Filter: (i = 3)
 Execution time: 0.061 ms
(7 rows)

so=> SET constraint_exclusion = off;
SET
so=> explain analyze execute so83(3);
                                                 QUERY PLAN
------------------------------------------------------------------------------------------------------------
 Result  (cost=0.00..84.02 rows=27 width=4) (actual time=0.030..0.033 rows=1 loops=1)
   ->  Append  (cost=0.00..83.75 rows=27 width=0) (actual time=0.029..0.032 rows=1 loops=1)
         ->  Seq Scan on so81  (cost=0.00..0.00 rows=1 width=0) (actual time=0.004..0.004 rows=0 loops=1)
               Filter: (i = 3)
         ->  Seq Scan on so82  (cost=0.00..41.88 rows=13 width=0) (actual time=0.025..0.026 rows=1 loops=1)
               Filter: (i = 3)
         ->  Seq Scan on so83  (cost=0.00..41.88 rows=13 width=0) (actual time=0.002..0.002 rows=0 loops=1)
               Filter: (i = 3)
 Execution time: 0.126 ms
(9 rows)

是否可以动态地将JSX添加到React代码中

2 个答案: