在文本框中插入值/将光标移动到末尾

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;    }} 

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