我需要一点帮助来完成这个功能:
function passar() {
var fotos1 = document.getElementById("foto1");
var fotos2 = document.getElementById("foto2");
var fotos3 = document.getElementById("foto3");
if ( fotos1.style.display = "block" ) {
fotos1.style.display = "none";
fotos2.style.display = "block";
} else if ( fotos2.style.display = "block" ) {
fotos2.style.display = "none";
}
}
当第一个条件改变时 它应该隐藏"fotos 2" 但是它没有工作,有人知道为什么吗?
用于转让
比较
严格比较
if (fotos1.style.display === "block") {
fotos1.style.display = "none";
fotos2.style.display = "block";
} else if (fotos1.style.display === "none") {
fotos2.style.display = "none";
}
}
您的有条件声明是做一项任务而不是比较:
if (fotos1.style.display === "block") {
fotos1.style.display = "none";
fotos2.style.display = "block";
} else if (fotos1.style.display === "none") {
fotos2.style.display = "block";
}
另外,建议使用 与弱比较 进行严格比较。在有些浏览器中,比较的附加好处也是大约4X更快。
在此情况下, 您应该使用双倍等值的比较操作器 :
if (fotos1.style.display == "block") {
相反,您正在使用一个单等值,该等值是一个任务参数:
if (fotos1.style.display = "block") {
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