Javascript学习笔记:错误处理

Java代码

html  
head  
  titlejavascript/title  
    script type="text/javascript"  
        function test(inVal){  
            try{  
                inVal=inVal.toUpperCase();  
            }catch(error){  
                alert("An exception has occurred.Error was:nn"+error.message);  
            }  
        }  
    /script  
/head  
body  
input type="button" value="Test" onclick="test(null);"  
/body  
/html 

html
head
  titlejavascript/title
    script type="text/javascript"
        function test(inVal){
            try{
                inVal=inVal.toUpperCase();
            }catch(error){
                alert("An exception has occurred.Error was:nn"+error.message);
            }
        }
    /script
/head
body
input type="button" value="Test" onclick="test(null);"
/body
/html

利用firefox的firebug来调bug

引用

html
head
  titlejavascript/title
    script type="text/javascript"
        function test(){
            var a=0;
            console.log("checkpoint 1");
            a=a+1;
            console.log("checkpoint 2");
            a=a-1;
            console.log("checkpoint 3");
            a=a.toLowerCase();
            console.log("checkpoint 4");
        }
    /script
/head
body
input type="button" value="Test" onclick="test(null);"
/body
/html

在IE中可以添加一个方法

引用

        function Console(){
            this.log=function(inText){
                alert(inText);
            }
        }
       var console=new Console();