输入框获取光标焦点并添加数据

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//获取光标

function doGetCaretPosition (oField) {            // Initialize            var iCaretPos ;            // IE Support            if (document.selection) {                // Set focus on the element                oField.focus();                // To get cursor position, get empty selection range                var oSel = document.selection.createRange();                // Move selection start to 0 position                oSel.moveStart('character', -oField.value.length);                // The caret position is selection length                iCaretPos = oSel.text.length;            }            // Firefox support            else if (oField.selectionStart || oField.selectionStart == '0')                iCaretPos = oField.selectionStart;            console.log(iCaretPos)            // Return results            return iCaretPos;        }

//截取字符串

String.prototype.insert = function (index, item) {            var temp = [];            for (var i = 0; i < this.length; i++) {                temp.push(this[i]);            }            temp.splice(index, 0, item);            console.log(temp.join(""))            return temp.join("")        };

//js

string.insert(0,'jia')

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