Question

我正在尝试使用if三元运算符识别我的页面（用于菜单）。

$page_name = "workers";

($page_name != "home") ? echo "home";

所以我认为应该出现“家”，但不是。 Parser向我显示错误：

解析错误：语法错误，意外'？'

我做错了什么？

Answer 1

你ternary syntax错了，试试这个：

// Vertex Shader Code
var vertexShaderText = [
'precision mediump float;',
'',
'attribute vec2 vertPosition;',
'',
'void main() {',
'   gl_Position = vec4(vertPosition, 0.0, 1.0);',
'}'
].join('/n');


// Fragment Shader Code
var fragmentShaderText = [
'precision mediump float;',
'',
'void main() {',
'   gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);',
'}'
].join('/n');


var initApp = function() {

    // Check for errors
    console.log("The app is working so far");

    var canvas = document.getElementById('game-canvas'); 
    var gl = canvas.getContext('webgl');

    if (!gl) {
        gl = canvas.getContext('experimental-webgl');
    }

    if (!gl) {
        alert('Sorry, your web browser does not support WebGL. Please try opening this page in a different browser.');
    }

    // Clear color and depth buffers and set the background window color
    gl.clearColor(0.3, 0.7, 0.5, 0.7);
    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

    // Create vertex and fragment shader objects
    var vertexShader = gl.createShader(gl.VERTEX_SHADER);
    var fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);

    // Load and compile shaders from code provided in 'vertexShaderText' and 'fragmentShaderText'
    gl.shaderSource(vertexShader, vertexShaderText);
    gl.shaderSource(fragmentShader, fragmentShaderText);

    gl.compileShader(vertexShader); 
    gl.compileShader(fragmentShader);

    // Check for GL compilation errors (because they often are not explicit)
    if (!gl.getShaderParameter(vertexShader, gl.COMPILE_STATUS)) {
        console.error('Error compiling vertex shaders:', gl.getShaderInfoLog(vertexShader));
    }
    if (!gl.getShaderParameter(fragmentShader, gl.COMPILE_STATUS)) {
        console.error('Error compiling fragment shaders:', gl.getShaderInfoLog(fragmentShader));
    }
};

“如果”三元与echo（）。 Parser向我显示错误

1 个答案: