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cannot get variable value

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Hi, i want to pass value from the HTML element to the type script variable , but when i write this.ShowMs(show), it show error of "Property 'ShowMs' does not exist  on type 'HTMLElement'. Anyone know what i missing? Below is the code.

ping():void{
var intStartTime;
intStartTime = +new Date();
var objIMG = new Image();
var show;
 
objIMG.src = this.url + "/" + intStartTime ;
 
objIMG.onload =
objIMG.onerror =
function()
{
 
var delay = Number(new Date()) - Number(intStartTime);
 
show = (delay<1)?("<1"):(" = "+delay);
 
console.log( " Ping" + show + " ms");
 
this.ShowMs(show);
}
 
 
}
 
ShowMs(passData:any):void{
 
if(passData < 100){
this.txt.color = "#3FFF00";
this.txt.text = passData;
}else if(passData < 300){
this.txt.color = "#C5FF0D";
this.txt.text = passData;
}else if(passData > 300){
this.txt.color = "#FF0000";
this.txt.text = passData;
}else{
this.txt.color = "#FF0000";
this.txt.text = passData;
}
}

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