不多说，自己看

var i = “想要学习c++"
if(i==''){
console.log('qun：474392670')
}
else{
console.log('thanks!!!')
}

楼主把网页脚本的JavaScript语法都搬出来了。可惜现在的QQ对电脑的支持度太低，所以我不上QQ了

var i = “想要学习c++"
if(i==''){
console.log('qun：474392670')
}
else{
console.log('thanks!!!')
}

var i = “想要学习c++"
if(i==''){
console.log('qun：474392670')
}
else{
console.log('thanks!!!')
}

var i = “想要学习c++"
if(i==''){
console.log('qun：474392670')
}
else{
console.log('thanks!!!')
}

var i = “想要学习c++"
if(i==''){
console.log('qun：474392670')
}
else{
console.log('thanks!!!')
}