eval.js

来自「这是《JavaScript学习源代码》一书的源代码」· JavaScript 代码 · 共 8 行

// store the text input name
var inputname = "textfield";

// store the string to assign
var inputtext = " \"JavaScript Text\" ";

// evaluate the assignation expression 
eval("document.forms.f."+inputname+".value="+inputtext);