Question

我正在尝试创建一个脚本，每次按顺序单击按钮时，它将运行不同的函数。因此，例如，当单击按钮时，它将首先运行tick1函数，然后再次按下它将运行tick2函数。这是我的尝试，但它只会运行tick1函数。非常感谢，西蒙

<script>
var trafficktick = 1;
function tick() {
    if (trafficktick = 1) {
        tick1()
        var traffictick =  trafficktick + 1;
    } else if (trafficktick = 2) {
        tick2()
        var traffictick = trafficktick + 1;
    } else {
        var trafficktick = 1;
    }
} 
</script>

Answer 1

在if条件中使用===而非=

Answer 2

完成多个错误：

您使用=（分配值）而不是===（比较）
你错误地写了trafficktick
而不是var trafficktick = trafficktick + 1;。只需trafficktick++;

＆＃13;

var trafficktick = 1;

function tick() {
  if (trafficktick === 1) {
    //tick1();
    console.log("Call tick1");
    trafficktick++;
  } else if (trafficktick === 2) {
    //tick2();
     console.log("Call tick2");
    trafficktick++;
  } else {
    trafficktick = 1;
  }
}

＆＃13;

<button onclick="tick()">Click me</button>

＆＃13;

Answer 3

您的JavaScript中存在一些错误，请尝试以下操作：

<script>
    var trafficktick = 1; // Use var only here

    function tick() {

        // Use '==' or '===' depending on your logic operation to 
        // compare equality
        if (trafficktick == 1) { 

            // You want that? You can comment this call and call
            // it outside from an element (for example)
            tick1(); 
            traffictick ++; // Only '++' and no 'var' 

        } else if (trafficktick == 2) {

            tick2();
            traffictick ++; // Only '++' and no 'var'

        } else {

            trafficktick = 1; // No 'var'

        }
    } 
</script>

如果脚本无效，则为HTML按钮

3 个答案: