run script string

loadScriptString

//运行插入页面的javascript代码
function loadScriptString(s){
    var a = document.createElement('script');
    a.type = 'text/javascript';
    var t = document.createTextNode(s);
    try{
        a.appendChild(t);
    }catch(e){
        a.text = s;
    }
    document.getElementsByTagName('head')[0].appendChild(a);
}
loadScriptString('alert(1)');