JavaScript是否支持<=運算符？

我在JavaScript這樣做：JavaScript是否支持<=運算符？

function doClick() { 
    var theValue = document.getElementById("theForm:theField").value; 
    var theLength = theValue.length; 

    if(theLength <= 3) --> Error 
    { 
    alert('Character length too small.'); 
    } 
}

而且thefield的JSF組件：

<h:form id="theForm"> 
    <h:commandButton id="theField" action="#{theBean.doFunctionA}" onclick="doClick()"/>

當我使這個在IE中，它告訴我這個錯誤：

Caused by: javax.faces.view.facelets.FaceletException: Error Parsing /viewMetadata/pages/thePage.xhtml: Error Traced[line: 66] The content of elements must consist of well-formed character data or markup. 
    at org.apache.myfaces.view.facelets.compiler.SAXCompiler.doCompileViewMetadata(SAXCompiler.java:716) 
    at org.apache.myfaces.view.facelets.compiler.Compiler.compileViewMetadata(Compiler.java:126) 
    at org.apache.myfaces.view.facelets.impl.DefaultFaceletFactory._createViewMetadataFacelet(DefaultFaceletFactory.java:311) 
    at org.apache.myfaces.view.facelets.impl.DefaultFaceletFactory.getViewMetadataFacelet(DefaultFaceletFactory.java:394) 
    at org.apache.myfaces.view.facelets.impl.DefaultFaceletFactory.getViewMetadataFacelet(DefaultFaceletFactory.java:376) 
    at org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage._getViewMetadataFacelet(FaceletViewDeclarationLanguage.java:1940) 
    at org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.access$000(FaceletViewDeclarationLanguage.java:129) 
    at org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage$FaceletViewMetadata.createMetadataView(FaceletViewDeclarationLanguage.java:2049) 
    at org.apache.myfaces.lifecycle.RestoreViewExecutor.execute(RestoreViewExecutor.java:161) 
    at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:171) 
    at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:189) 
    ... 52 more

如果我用這個替換錯誤行：

if(theLength == '3' || theLength == '2' || theLength == '1')

然後一切工作正常。我真的不明白究竟發生了什麼？

來源

2012-11-08 huahsin68

操作員應該工作得很好。 1.你確定這就是66線上的所有東西嗎？ 2.是否有隱藏的字符（可能是你在那裏複製/粘貼的東西？） – sachleen

如果你這樣做會發生什麼：'if（theLength =='3'|| theLength =='2'|| theLength =='1 '|| theLength =='0'）'？ – Sheena

提供的錯誤消息：

Caused by: javax.faces.view.facelets.FaceletException: Error Parsing 
/viewMetadata/pages/thePage.xhtml: Error Traced[line: 66] 
The content of elements must consist of well-formed character data or markup.

這聽起來像它試圖解析爲XML。你應該在什麼逃脫你通常會在JSF需要讀了，但的第一件事嘗試只是逃避它作爲XML：

if (theLength &lt;= 3)

當診斷錯誤，但要認識到這是不是很重要實際上擊中瀏覽器的Javascript引擎 - 問題是在生成頁面。

來源

2012-11-08 06:44:34

哦，夥計！這不是一個笑話。但它的工作！ – huahsin68

JavaScript是否支持<=運算符？

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