console 命令行工具 X clear

console

function submit(){
    var text=document.getElementById("text").value;
    var getText=text
    text=""
    if (getText!=""){
        console.log(getText)
        return 1
    }
    alert("不能为空")
    return 0
}

<input id="text"><input type="button" value="submit" onclick="submit()">