Inserts the content at the cursor.

function Insertatcursor (MyField, myvalue) {
if (document.selection) {//ie
Myfield.focus ();
var sel = Document.selection.createRange (); Create Range Object
Sel.text = myvalue; Since the length of the Range object we select is the cursor, the insertion value can be directly assigned
}else if (Myfield.selectionstart | | myfield.selectionstart = = ' 0 ') {
var startpos = Myfield.selectionstart; The beginning of the cursor
var endpos = myfield.selectionend; End of cursor

Refactor value, the value taken from the starting point of the cursor plus the value inserted at the cursor and the intercept value equal to the new value at the end of the cursor to the end of the value

Myfield.value = myField.value.substring (0, startpos) + myvalue + myField.value.substring (endpos, MyField.value.length) ;
}
}

Inserts the content at the cursor.