我如何执行一些JavaScript是一个字符串?
function ExecuteJavascriptString()
{
var s = "alert('hello')";
// how do I get a browser to alert('hello')?
}
当前回答
Eval应该这样做。
eval(s);
其他回答
eval(s);
但如果你从用户那里获取数据，这可能是危险的，尽管我想如果他们自己的浏览器崩溃了，那是他们的问题。
Eval应该这样做。
eval(s);
Stefan的回答延伸如下:
//Executes immediately function stringToFunctionAndExecute(str) { let func = new Function(str); return (func()); // <--- note the parenteces } //Executes when called function stringToFunctionOnly(str) { let func = new Function(str); return func; } // -^-^-^- Functions -^-^-^- (feel free to copy) // -v-v-v- Explanations -v-v-v- (run code to read easier) console.log('STEP 1, this executes directly when run:') let func_A = stringToFunctionAndExecute("console.log('>>> executes immediately <<<')"); console.log("STEP 2, and you can't save it in a variable, calling a() will throw an error, watch:") try { func_A(); } catch (error) { console.log('STEP ERROR, see, it failed', error) } console.log('STEP 3, but this will NOT execute directly AND you can save it for later...') let func_B = stringToFunctionOnly("console.log('>>> executes when called <<<')"); console.log("STEP 4, ...as you see, it only run when it's called for, as is done now:") func_B(); console.log('STEP 5, TADAAAAA!!')
检查了许多复杂和混乱的脚本:
var js = "alert('Hello, World!');" // put your JS code here
var oScript = document.createElement("script");
var oScriptText = document.createTextNode(js);
oScript.appendChild(oScriptText);
document.body.appendChild(oScript);
不确定这是不是作弊:
window.say = function(a) { alert(a); };
var a = "say('hello')";
var p = /^([^(]*)\('([^']*)'\).*$/; // ["say('hello')","say","hello"]
var fn = window[p.exec(a)[1]]; // get function reference by name
if( typeof(fn) === "function")
fn.apply(null, [p.exec(a)[2]]); // call it with params
