如何修复while控制器中的Javascript错误？

我在Jmeter脚本中使用While控制器。我在while控制器中给出了以下条件

${uuu javaScript（${counter}<10）}

虽然条件按预期工作，但它在日志中抛出以下错误

2019-02-02 15:58:21,315 ERROR o.a.j.f.JavaScript: Error processing Javascript: [${counter} < 10]

javax.script.ScriptException: <eval>:1:1 Expected ; but found {
${counter} < 10
 ^ in <eval> at line number 1 at column number 1
    at jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(NashornScriptEngine.java:470) ~[nashorn.jar:?]
    at jdk.nashorn.api.scripting.NashornScriptEngine.compileImpl(NashornScriptEngine.java:537) ~[nashorn.jar:?]
    at jdk.nashorn.api.scripting.NashornScriptEngine.compileImpl(NashornScriptEngine.java:524) ~[nashorn.jar:?]
    at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:402) ~[nashorn.jar:?]
    at jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:155) ~[nashorn.jar:?]
    at org.apache.jmeter.functions.JavaScript.executeWithNashorn(JavaScript.java:142) [ApacheJMeter_functions.jar:3.2 r1790748]
    at org.apache.jmeter.functions.JavaScript.execute(JavaScript.java:103) [ApacheJMeter_functions.jar:3.2 r1790748]
    at org.apache.jmeter.engine.util.CompoundVariable.execute(CompoundVariable.java:141) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.engine.util.CompoundVariable.execute(CompoundVariable.java:116) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.testelement.property.FunctionProperty.getStringValue(FunctionProperty.java:101) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.control.WhileController.getCondition(WhileController.java:124) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.control.WhileController.endOfLoop(WhileController.java:56) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.control.WhileController.next(WhileController.java:102) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.control.GenericController.nextIsAController(GenericController.java:219) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.control.GenericController.next(GenericController.java:173) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.control.LoopController.next(LoopController.java:123) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.control.GenericController.nextIsAController(GenericController.java:219) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.control.GenericController.next(GenericController.java:173) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.control.LoopController.next(LoopController.java:123) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.threads.AbstractThreadGroup.next(AbstractThreadGroup.java:87) [ApacheJMeter_core.jar:3.2 r1790748]
    at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:274) [ApacheJMeter_core.jar:3.2 r1790748]

2019-02-02 15:58:21315错误o.a.j.f.JavaScript:处理JavaScript时出错：[${counter}<10]
javax.script.ScriptException:：应为1:1；但是发现{
${counter}<10
^在第1行第1列中
在jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException（NashornScriptEngine.java:470）~[nashorn.jar:？]
在jdk.nashorn.api.scripting.NashornScriptEngine.compileImpl（NashornScriptEngine.java:537）~[nashorn.jar:？]
在jdk.nashorn.api.scripting.NashornScriptEngine.compileImpl（NashornScriptEngine.java:524）~[nashorn.jar:？]
在jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl（NashornScriptEngine.java:402）~[nashorn.jar:？]
在jdk.nashorn.api.scripting.NashornScriptEngine.eval（NashornScriptEngine.java:155）~[nashorn.jar:？]
在org.apache.jmeter.functions.JavaScript.executeWithNashorn（JavaScript.java:142）[ApacheJMeter_functions.jar:3.2 r1790748]
在org.apache.jmeter.functions.JavaScript.execute（JavaScript.java:103）[ApacheJMeter_functions.jar:3.2 r1790748]
在org.apache.jmeter.engine.util.CompoundVariable.execute（CompoundVariable.java:141）[ApacheJMeter_core.jar:3.2 r1790748]
在org.apache.jmeter.engine.util.CompoundVariable.execute（CompoundVariable.java:116）[ApacheJMeter_core.jar:3.2 r1790748]
位于org.apache.jmeter.testelement.property.FunctionProperty.getStringValue（FunctionProperty.java:101）[ApacheJMeter_core.jar:3.2 r1790748]
位于org.apache.jmeter.control.WhileController.getCondition（WhileController.java:124）[ApacheJMeter_core.jar:3.2 r1790748]
在org.apache.jmeter.control.WhileController.endOfLoop（WhileController.java:56）[ApacheJMeter_core.jar:3.2 r1790748]
在org.apache.jmeter.control.WhileController.next（WhileController.java:102）[ApacheJMeter_core.jar:3.2 r1790748]
在org.apache.jmeter.control.GenericController（GenericController.java:219）[ApacheJMeter_core.jar:3.2 r1790748]
在org.apache.jmeter.control.GenericController.next（GenericController.java:173）[ApacheJMeter_core.jar:3.2 r1790748]
在org.apache.jmeter.control.LoopController.next（LoopController.java:123）[ApacheJMeter_core.jar:3.2 r1790748]
在org.apache.jmeter.control.GenericController（GenericController.java:219）[ApacheJMeter_core.jar:3.2 r1790748]
在org.apache.jmeter.control.GenericController.next（GenericController.java:173）[ApacheJMeter_core.jar:3.2 r1790748]
在org.apache.jmeter.control.LoopController.next（LoopController.java:123）[ApacheJMeter_core.jar:3.2 r1790748]
在org.apache.jmeter.threads.AbstractThreadGroup.next（AbstractThreadGroup.java:87）[ApacheJMeter_core.jar:3.2 r1790748]
在org.apache.jmeter.threads.JMeterThread.run（JMeterThread.java:274）[ApacheJMeter_core.jar:3.2 r1790748]

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任何人都知道这个错误背后的原因吗？如何修复它？

也许你错过了更多的背景信息

var计数器=42，
__javaScript=v=>`got${v}`；
log（`${uu javaScript（`${counter}`<10}`）；
//^^ ^

可能在第一次迭代过程中未定义

${counter}

变量，选项如下：

给

${counter}

变量一个初始值，使用

检查

计数器

变量是否使用

然而，你可以通过迁移到（顺便说一句）一箭双雕，条件是：

${__groovy(vars.get('counter') == null || (vars.get('counter') as int) < 10,)}

${groovy（vars.get（'counter'）==null（vars.get（'counter'）as int）<10，）}