JavaScript 控制台显示 : Invalid left-side assignment?

Question

所以，这是为了进行安全登录。我通过 chrome 的 javascript 控制台运行此命令，并得到“ Uncaught ReferenceError :赋值中的左侧无效”？!请帮忙!

function logIn() {
String.prototype.hashCode = function() {
        for(var ret = 0, i = 0, len = this.length; i < len; i++) {
        ret = (31 * ret + this.charCodeAt(i)) << 0;
    }
        return ret;
    };

var user = document.getElementById("username"),
    pass = document.getElementById("password");
if ((user = "Fedora") && (pass.hashCode() = -976887139)) {
    window.alert("Captain Fedora: SuperUser");

}
}   

Answer 1

if ((user = "Fedora") && (pass.hashCode() = -976887139))

应该是

if ((user == "Fedora") && (pass.hashCode() == -976887139))

所以你进行比较，而不是赋值