js 用于运行string中的之间的函数

/**
 * Created by 炜文 on 2017/2/15.
 */
var intext = '485222<script> var i=2;var j=2;console.log(i+j)</script>this is a script'
execScripts =function (intext) {
    var si=0;
    while (true){
        var ss = intext.indexOf("<"+"script"+">",si);
        if (ss==-1){
            return;
        }
        var se = intext.indexOf("<"+"/"+"script"+">",ss);
        if (se==-1){
            return;
        }
        si = se + 9;
        var sc = intext.substring(ss+8,se);
        eval(sc);
    }
}

execScripts(intext);