我创建了一个高图表，但它的格式化程序函数执行了两次。
formatter: function() {
console.log("start");
return this.value;
}
答案 0 :(得分：2)
基于Breakpoint Generator. ，看起来它是一个回调函数，只要显示工具提示就会触发它。
因此，每次将鼠标悬停在某个元素上时，系统会调用#Create a simulator object
set ns [new Simulator]
#Define different colors for data flows (for NAM)
$ns color 1 Blue
$ns color 2 Red
#Open the NAM trace file
set nf [open out.nam w]
$ns namtrace-all $nf
set nt [open test.tr w]
$ns trace-all $nt
#Define a 'finish' procedure
proc finish {} {
global ns nf nt
$ns flush-trace
#Close the NAM trace file
close $nf
close $nt
#Execute NAM on the trace file
exec nam out.nam &
exit 0
}
#Create four nodes
set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]
set n4 [$ns node]
set n5 [$ns node]
set n6 [$ns node]
#Create links between the nodes
$ns duplex-link $n1 $n2 10Mb 10ms DropTail
$ns duplex-link $n2 $n3 10Mb 20ms DropTail
$ns duplex-link $n3 $n4 10Mb 10ms DropTail
$ns duplex-link $n5 $n2 10Mb 10ms DropTail
$ns duplex-link $n3 $n6 10Mb 10ms DropTail
#Set Queue Size of link (n2-n3) to 10
$ns queue-limit $n2 $n3 10
#Give node position (for NAM)
$ns duplex-link-op $n1 $n2 orient right-down
$ns duplex-link-op $n5 $n2 orient right-up
$ns duplex-link-op $n2 $n3 orient right
$ns duplex-link-op $n3 $n4 orient right-up
$ns duplex-link-op $n6 $n3 orient left-up
#Monitor the queue for link (n2-n3). (for NAM)
$ns duplex-link-op $n2 $n3 queuePos 0.5
#Setup a TCP connection
set tcp [new Agent/TCP]
$tcp set class_ 2
$ns attach-agent $n1 $tcp
set sink [new Agent/TCPSink]
$ns attach-agent $n4 $sink
$ns connect $tcp $sink
$tcp set fid_ 1
#Setup a FTP over TCP connection
set ftp [new Application/FTP]
$ftp attach-agent $tcp
$ftp set type_ FTP
#Setup a UDP connection
set udp [new Agent/UDP]
$ns attach-agent $n2 $udp
set null [new Agent/Null]
$ns attach-agent $n3 $sink
$ns connect $udp $sink
$udp set fid_ 2
#Setup a CBR over UDP connection
set cbr [new Application/Traffic/CBR]
$cbr attach-agent $udp
$cbr set type_ CBR
$cbr set packet_size_ 1000
$cbr set rate_ 1mb
$cbr set random_ false
#Schedule events for the CBR and FTP agents
$ns at 0.1 "$cbr start"
$ns at 1.0 "$ftp start"
$ns at 4.0 "$ftp stop"
$ns at 4.5 "$cbr stop"
#Detach tcp and sink agents (not really necessary)
$ns at 4.5 "$ns detach-agent $n1 $tcp ; $ns detach-agent $n4 $sink"
函数为该点生成相应的工具提示，如documentation for the formatter() function中的一组警报所示，并在下面演示：
答案 1 :(得分：1)