JS在TextArea光标位置插入文字+移动光标到文字末尾

function insertText(obj,str) {

    if (document.selection) {

        var sel = document.selection.createRange();

        sel.text = str;

    } else if (typeof obj.selectionStart === 'number' && typeof obj.selectionEnd === 'number') {

        var startPos = obj.selectionStart,

            endPos = obj.selectionEnd,

            cursorPos = startPos,

            tmpStr = obj.value;

        obj.value = tmpStr.substring(0, startPos) + str + tmpStr.substring(endPos, tmpStr.length);

        cursorPos += str.length;

        obj.selectionStart = obj.selectionEnd = cursorPos;

    } else {

        obj.value += str;

    }

}

function moveEnd(obj){

    obj.focus();

    var len = obj.value.length;

    if (document.selection) {

        var sel = obj.createTextRange();

        sel.moveStart('character',len);

        sel.collapse();

        sel.select();

    } else if (typeof obj.selectionStart == 'number' && typeof obj.selectionEnd == 'number') {

        obj.selectionStart = obj.selectionEnd = len;

    }


}

 

在网上看了很多用js 将光标移动到textarea的最后，但是看了很多垃圾方法，屁不管用，浪费时间，最近用到一个新方法

=IE支持document.selection
=Firefox，Chrome,Safari以及Opera都有selectionStart和selectionEnd属性