原生态js方法实现全选复制功能

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function selectCode(objid){
    var obj = document.getElementById(objid);
    obj.select();
}
function selectText(obj) {
    var text = obj;
    if (document.body.createTextRange) {
        var range = document.body.createTextRange();
        range.moveToElementText(text);
        range.select();
    } else if (window.getSelection) {
        var selection = window.getSelection();
        var range = document.createRange();
        range.selectNodeContents(text);
        selection.removeAllRanges();
        selection.addRange(range);
    } else {
        alert("none");
    }
}

function selectCode(objid){ var obj = document.getElementById(objid); obj.select(); } function selectText(obj) { var text = obj; if (document.body.createTextRange) { var range = document.body.createTextRange(); range.moveToElementText(text); range.select(); } else if (window.getSelection) { var selection = window.getSelection(); var range = document.createRange(); range.selectNodeContents(text); selection.removeAllRanges(); selection.addRange(range); } else { alert("none"); } }