断点
setBreakpoint()
,sb()
: 在当前行上设置断点setBreakpoint(line)
,sb(line)
: 在特定行上设置断点setBreakpoint('fn()')
,sb(...)
: 在函数体的第一条语句上设置断点setBreakpoint('script.js', 1)
,sb(...)
: 在script.js
的第一行上设置断点setBreakpoint('script.js', 1, 'num < 4')
,sb(...)
: 在script.js
的第一行上设置条件断点,仅当num < 4
评估为true
时才中断clearBreakpoint('script.js', 1)
,cb(...)
: 清除script.js
中第 1 行上的断点
还可以在尚未加载的文件(模块)中设置断点:
$ node inspect main.js
< Debugger listening on ws://127.0.0.1:9229/48a5b28a-550c-471b-b5e1-d13dd7165df9
< For help, see: https://nodejs.org/en/docs/inspector
<
connecting to 127.0.0.1:9229 ... ok
< Debugger attached.
<
Break on start in main.js:1
> 1 const mod = require('./mod.js');
2 mod.hello();
3 mod.hello();
debug> setBreakpoint('mod.js', 22)
Warning: script 'mod.js' was not loaded yet.
debug> c
break in mod.js:22
20 // USE OR OTHER DEALINGS IN THE SOFTWARE.
21
>22 exports.hello = function() {
23 return 'hello from module';
24 };
debug>
也可以设置条件断点,仅当给定的表达式评估为 true
时才中断:
$ node inspect main.js
< Debugger listening on ws://127.0.0.1:9229/ce24daa8-3816-44d4-b8ab-8273c8a66d35
< For help, see: https://nodejs.org/en/docs/inspector
<
connecting to 127.0.0.1:9229 ... ok
< Debugger attached.
Break on start in main.js:7
5 }
6
> 7 addOne(10);
8 addOne(-1);
9
debug> setBreakpoint('main.js', 4, 'num < 0')
1 'use strict';
2
3 function addOne(num) {
> 4 return num + 1;
5 }
6
7 addOne(10);
8 addOne(-1);
9
debug> cont
break in main.js:4
2
3 function addOne(num) {
> 4 return num + 1;
5 }
6
debug> exec('num')
-1
debug>
setBreakpoint()
,sb()
: Set breakpoint on current linesetBreakpoint(line)
,sb(line)
: Set breakpoint on specific linesetBreakpoint('fn()')
,sb(...)
: Set breakpoint on a first statement in function's bodysetBreakpoint('script.js', 1)
,sb(...)
: Set breakpoint on first line ofscript.js
setBreakpoint('script.js', 1, 'num < 4')
,sb(...)
: Set conditional breakpoint on first line ofscript.js
that only breaks whennum < 4
evaluates totrue
clearBreakpoint('script.js', 1)
,cb(...)
: Clear breakpoint inscript.js
on line 1
It is also possible to set a breakpoint in a file (module) that is not loaded yet:
$ node inspect main.js
< Debugger listening on ws://127.0.0.1:9229/48a5b28a-550c-471b-b5e1-d13dd7165df9
< For help, see: https://nodejs.org/en/docs/inspector
<
connecting to 127.0.0.1:9229 ... ok
< Debugger attached.
<
Break on start in main.js:1
> 1 const mod = require('./mod.js');
2 mod.hello();
3 mod.hello();
debug> setBreakpoint('mod.js', 22)
Warning: script 'mod.js' was not loaded yet.
debug> c
break in mod.js:22
20 // USE OR OTHER DEALINGS IN THE SOFTWARE.
21
>22 exports.hello = function() {
23 return 'hello from module';
24 };
debug>
It is also possible to set a conditional breakpoint that only breaks when a
given expression evaluates to true
:
$ node inspect main.js
< Debugger listening on ws://127.0.0.1:9229/ce24daa8-3816-44d4-b8ab-8273c8a66d35
< For help, see: https://nodejs.org/en/docs/inspector
<
connecting to 127.0.0.1:9229 ... ok
< Debugger attached.
Break on start in main.js:7
5 }
6
> 7 addOne(10);
8 addOne(-1);
9
debug> setBreakpoint('main.js', 4, 'num < 0')
1 'use strict';
2
3 function addOne(num) {
> 4 return num + 1;
5 }
6
7 addOne(10);
8 addOne(-1);
9
debug> cont
break in main.js:4
2
3 function addOne(num) {
> 4 return num + 1;
5 }
6
debug> exec('num')
-1
debug>